A. (r2 – r1)/r1. r2
B. r1. r2/(r2 – r1)
C. (r2 + r1)/r1. r2
D. r1. r2/(r2 + r1)
Correct Answer: B. r1. r2/(r2 – r1) ✔
Last Updated: February 08, 2019
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