Find the one which does not belong to that group ?

Question

Answer 1

A. 20
B. 42
C. 58
D. 72

Explanation:

20 = 4² + 4, 42 = 6² + 6, 58 = 7² + 9, 72 = 8² + 8 and 90 = 9² + 9.

20, 42, 72 and 90 can be expressed in n² + n form but not 58.

Correct Answer: 58 ✔

Last Updated: February 07, 2020