Question

Anita and Bikram are two students. Their chances of solving a problem correctly are $\frac13$ and $\frac14$ respectively. If their probability of making a common error is $\frac{1}{20}$ and they both obtain same answer then the probability that their answer is correct, is :

• A. $\frac{1}{12}$
• B. $\frac{1}{40}$
• C. $\frac{13}{120}$
• D. $\frac{10}{13}$

Answer 1

Answer: (D)

$\frac{10}{13}$

Answer 2

The correct option is (D): $\frac{10}{13}$