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Permutations And Combinations MCQs

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1

Three flags each of different colours are available for a military exercise, Using these flags different codes can be generated by waving
I. Single flag of different colours
II. Any two flags in a different sequence of colours.
III. three flags in a different sequence of colours.
The maximum number of codes that can be generated is.

Option A: 6

Option B: 9

Option C: 15

Option D: 18

Correct Answer: 15 ✔


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2

A question paper consists of five problems, each problem having three internal choices. In how many ways can a candidate attempt one or more problems?

Option A: 63

Option B: 511

Option C: 1023

Option D: 15

Correct Answer: 1023 ✔


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3

In a class there are 20 boys and 25 girls. In how many ways can a boy and a girl be selected?

Option A: 400

Option B: 500

Option C: 600

Option D: 20

Correct Answer: 500 ✔


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4

In how many ways can three consonants and two vowels be selected from the letters of the word “TRIANGLE”?

Option A: 25

Option B: 13

Option C: 40

Option D: 30

Correct Answer: 30 ✔


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5

A bag contains nine yellow balls, three white balls and four red balls. In how many ways can two balls be drawn from the bag?

Option A: ⁹C₂

Option B: ³C₂

Option C: ¹⁶C₂

Option D: ¹²C₂

Correct Answer: ¹⁶C₂ ✔


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6

How many four digit even numbers can be formed using the digits {2, 3, 5, 1, 7, 9}

Option A: 60

Option B: 360

Option C: 120

Option D: 240

Correct Answer: 60 ✔


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7

How many four digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)?

Option A: 360

Option B: 60

Option C: 300

Option D: 180

Correct Answer: 360 ✔


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8

The number of ways in which six boys and six girls can be seated in a row for a photograph so that no two girls sit together is_________?

Option A: (6!)2

Option B: 6! * ⁷P₆

Option C: 2(6!)

Option D: 6! * 7

Correct Answer: ✔


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9

A letter lock consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most__________?

Option A: 216

Option B: 243

Option C: 215

Option D: 729

Correct Answer: 215 ✔


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10

A committee has 5 men and 6 women. What are the number of ways of selecting a group of eight persons?

Option A: 165

Option B: 185

Option C: 205

Option D: 225

Correct Answer: 165 ✔


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11

What are the number of ways to select 3 men and 2 women such that one man and one woman are always selected?

Option A: 100

Option B: 60

Option C: 30

Option D: 20

Correct Answer: 30 ✔


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12

A committee has 5 men and 6 women. What are the number of ways of selecting 2 men and 3 women from the given committee?

Option A: 150

Option B: 200

Option C: 250

Option D: 300

Correct Answer: 200 ✔


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13

The number of permutations of the letters of the word ‘MESMERISE’ is__________?

Option A: 9!/(2!)2 3!

Option B: 9!/(2!)3 3!

Option C: 9!/(2!)2 (3!)2

Option D: 5!/(2!)2 3!

Correct Answer: A. 9!/(2!)2 3! ✔


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14

The number of arrangements that can be made with the letters of the word MEADOWS so that the vowels occupy the even places?

Option A: 720

Option B: 144

Option C: 120

Option D: 36

Correct Answer: 144 ✔


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15

Using all the letters of the word “NOKIA”, how many words can be formed, which begin with N and end with A?

Option A: 3

Option B: 6

Option C: 24

Option D: 120

Correct Answer: 6 ✔


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16

Using all the letters of the word “THURSDAY”, how many different words can be formed?

Option A: 8

Option B: 8!

Option C: 7!

Option D: 7

Correct Answer: 8 ✔


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17

How many three letter words are formed using the letters of the word TIME?

Option A: 12

Option B: 20

Option C: 16

Option D: 24

Correct Answer: 24 ✔


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18

A boy has nine trousers and 12 shirts. In how many different ways can he select a trouser and a shirt?

Option A: 21

Option B: 12

Option C: 9

Option D: 108

Correct Answer: 108 ✔


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19

There are 30 people in a group. If all shake hands with one another , how many handshakes are possible?

Option A: 870

Option B: 435

Option C: 30!

Option D: 29! + 1

Correct Answer: 435 ✔


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20

In how many different ways can the letters of the word ‘OPTICAL’ be arranged so that the vowels always come together?

Option A: 120

Option B: 720

Option C: 4320

Option D: 2160

Correct Answer: 720 ✔


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21

In how many different ways can the letters of the word ‘MATHEMATICS’ be arranged so that the vowels always come together?

Option A: 10080

Option B: 4989600

Option C: 120960

Option D: None of these

Correct Answer: 120960 ✔


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22

How many 4-letter words with or without meaning, can be formed out of the letters of the word, ‘LOGARITHMS’, if repetition of letters is not allowed?

Option A: 40

Option B: 400

Option C: 5040

Option D: 2520

Correct Answer: 40 ✔


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23

In how many ways can a group of 5 men and 2 women be made out of a total of 7 men and 3 women?

Option A: 63

Option B: 90

Option C: 126

Option D: 45

Correct Answer: 63 ✔


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24

In how many different ways can four books A, B, C and D be arranged one above another in a vertical order such that the books A and B are never in continuous position?

Option A: 9

Option B: 12

Option C: 14

Option D: 18

Correct Answer: 12 ✔


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25

There are two identical red, two identical black, and two identical white balls.In how many different ways can the balls be placed in the cells (Each cell to contain one ball) shown above such that balls of the same colour do not occupy any two consecutive cells?

Option A: 15

Option B: 18

Option C: 24

Option D: 30

Correct Answer: 24 ✔


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26

Twelve people from a club, by picking lots. One of them will host a dinner for all once in a month. The number of dinners a particular member has to host in one year is________?

Option A: One

Option B: Zero

Option C: Three

Option D: Cannot be determined

Correct Answer: Cannot be determined ✔


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27

A person ordered 5 pairs of black socks and some pairs of brown socks. The price of a black pair was thrice that of a brown pair while preparing the bill the bill clerk inter-changed the number of black and brown pairs by mistake which increased the bill by 100% what was the number of pair of brown socks in the original order?

Option A: 10

Option B: 15

Option C: 20

Option D: 25

Correct Answer: 25 ✔


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28

A two number committee comprising of one male and the female number is to be constituted out of five male and 3 females. Amongst the females, Ms. A refused to be number committee in which Mr.B is taken as the number of how many different ways can the committee be constituted?

Option A: 11

Option B: 30

Option C: 14

Option D: 20

Correct Answer: 14 ✔


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29

A selection is to be made for one post of principal and two posts of vice-principal amongst the six candidates called for the interview only two are eligible for the post of principal while they all are eligible for the post of vice-principal. The number of possible combinations of selectees is__________?

Option A: 4

Option B: 12

Option C: 18

Option D: None of these

Correct Answer: None of these ✔


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30

A student has to opt for 2 subjects out of 5 subjects for a course. Namely commerce, economics, statistics, mathematics 1 and Mathematics 2, Mathematics 2 can be offered only if mathematics 1 has also opted. The number of different combinations of two subjects which can be opted is_________?

Option A: 5

Option B: 6

Option C: 7

Option D: 18

Correct Answer: 7 ✔


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31

2 men and 1 woman board a bus of which 5 seats are vacant, one of these 5 seats is reserved for ladies. A woman may or may not sit on the seat reserved for ladies, In how many different ways can the five seats be occupied by these passengers?

Option A: 15

Option B: 36

Option C: 48

Option D: 60

Correct Answer: 36 ✔


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32

Three dice (each having six faces with each face having one number from 1 or 6) are ralled. What is the number of possible outcomes such that atleast one dice shows the number 2?

Option A: 36

Option B: 81

Option C: 91

Option D: 116

Correct Answer: 91 ✔


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33

A mixed doubles tennis game is to be played two teams(each consists of one male and one female) There are four married couples. No team is to consist a husband and his wife. What is the maximum number of games that can be played?

Option A: 12

Option B: 48

Option C: 36

Option D: 42

Correct Answer: 42 ✔


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34

In a question paper, there are four multiple choice type questions, each question has five choices with only one choice for it’s correct answer. What is the total number of ways in which a candidate will not get all the four answers correct?

Option A: 19

Option B: 120

Option C: 624

Option D: 1024

Correct Answer: 624 ✔


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35

In how many different ways can six players be arranged in a line such that two of them, Asim and Raheem are never together?

Option A: 120

Option B: 240

Option C: 360

Option D: 480

Correct Answer: 480 ✔


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36

Groups each containing 3 boys are to be formed out of 5 boys. A, B, C, D and E such that no group can contain both C and D together. What is the maximum number of such different groups?

Option A: 5

Option B: 6

Option C: 7

Option D: 8

Correct Answer: 7 ✔


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37

A question paper had 10 questions. Each question could only be answered as true(T) of False(F). Each candidate answered all the questions, Yet no two candidates wrote the answers in an identical sequence. How many different sequences of answers are possible?

Option A: 20

Option B: 40

Option C: 512

Option D: 1024

Correct Answer: 1024 ✔


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38

Six points are marked on a straight line and five points are marked on another line which is parallel to the first line. How many straight lines, including the first two, can be formed with these points?

Option A: 29

Option B: 32

Option C: 55

Option D: 30

Correct Answer: 32 ✔


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39

A group of 10 representatives is to be selected out of 12 seniors and 10 juniors. In how many different ways can the group be selected if it should have at least one senior?

Option A: ²²C₁₀

Option B: ²²C₁₀ + 1

Option C: ²²C₉ + ¹⁰C₁

Option D: ²²C₁₀ – 1

Correct Answer: ²²C₁₀ ✔


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40

A group of 10 representatives is to be selected out of 12 seniors and 10 juniors. In how many different ways can the group be selected, if it should have 5 seniors and 5 juniors?

Option A: ¹²C₅ * 10

Option B: ¹²C₇ * 10

Option C: ¹²C₇ * ¹⁰C₅

Option D: 12 * ¹⁰C₅

Correct Answer: ¹²C₇ * ¹⁰C₅ ✔


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41

A group consists of 4 men, 6 women and 5 children. In how many ways can 3 men, 2 women and 3 children selected from the given group?

Option A: 300

Option B: 450

Option C: 600

Option D: 750

Correct Answer: 600 ✔


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42

A group consists of 4 men, 6 women and 5 children. In how many ways can 2 men , 3 women and 1 child selected from the given group?

Option A: 300

Option B: 600

Option C: 750

Option D: 900

Correct Answer: 600 ✔


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43

Find the number of ways of arranging the letters of the word “MATERIAL” such that all the vowels in the word are to come together?

Option A: 720

Option B: 1440

Option C: 1860

Option D: 2160

Correct Answer: 1440 ✔


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44

The number of new words that can be formed by rearranging the letters of the word ‘ALIVE’ is__________?

Option A: 24

Option B: 23

Option C: 119

Option D: 120

Correct Answer: 119 ✔


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45

A delegation of 5 members has to be formed from 3 ladies and 5 gentlemen. In how many ways the delegation can be formed, if 2 particular ladies are always included in the delegation?

Option A: 20

Option B: 54

Option C: 42

Option D: 60

Correct Answer: 20 ✔


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46

The number of sequences in which 7 players can throw a ball, so that the youngest player may not be the last is -.

Option A: 4000

Option B: 2160

Option C: 4320

Option D: 5300

Correct Answer: 4320 ✔


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47

In how many ways can live boys and three girls sit in a row such that all boys sit together?

Option A: 4800

Option B: 5760

Option C: 2880

Option D: 15000

Correct Answer: 2880 ✔


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