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Q.

Two persons A and B toss two coins one after another. The person who throws one head and one tail is the winner. If A starts the game the probability that B wins the game is

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a

12

b

23

c

13

d

14

answer is C.

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Detailed Solution

two coins thrown

P(Wins)=P(1H, 1T)=24=12 P(Lose)=12

A start the game

P(Bwins)=P(L) P(W)+P(L) P(L) PLL) P(W).... =122+124+.... =1221-122=13

 

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