65. 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 

(B) 1/3 

(C) 1/2 

(D) 2/3

Hint: 

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