Q. 10 You are given three coins: one has heads on both faces, the second has tails on both faces, and the third has a head on one face and a tail on the other. You choose a coin at random and toss it, and it comes up heads. The probability that the other face is tails is (A) 1/4 (C) 1/2 (B) 1/3 (D) 2/3