Q.

The probability that A speaks truth is45 , while this probability for B is34 . The probability that they contradict

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a

45

b

15

c

720

d

320

answer is C.

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Detailed Solution

A and B will contradict each other if one speaks truth and other false                  p(A)=4/5.            p(B)=¾                                            =p(A) p(B)+P(A)P(B)                                                   =45×14+15×34=720
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