Q.

A box contains 10 mangoes out of which 4 are rotten. Two mangoes are taken out together. If one of them is found to be good, then the probability that both are good is

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a

513

b

813

c

15

d

23

answer is A.

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Detailed Solution

P(E)=C2   6C1   4×C1   6+C2   6=513
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