Question

You are given three coins: one has heads on both faces, the seconds 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
• B. 1/3
• C. 1/2
• D. 2/3

Answer 1

The correct option is B 1/3

For other face to be tail, the only possible case is that the third coin is selected out of 3 coins.
$P=\frac{\text{3rd coin selected}}{\text{Total no. of coins}}=\frac{1}{3}$