Question

A bag contains 2n + 1 coins. It is known that n of these coins have head on both sides whereas the other n + 1 coins are fair. One coin is selected at random and tossed. If the probability that toss results in heads is $\frac{31}{42}$, then the value of n is

• A. 8
• B. 5
• C. 10
• D. 6

Answer 1

Answer: (C)

10

Answer 2

The correct answer is (C) : 10.