A box contains 10 mangoes out of which 4 are rotten. 2 mangoes are taken out together

A box contains 10 mangoes out of which 4 are rotten. 2 mangoes are taken out together. If one of them is found to be good, the probability that the other is also good is?

(a) 1/3

(b)  8/15

(c)  5/13

(d) 2/13

Sol:

A = Event that first mango is good.

B = Event that second mango is good.

Reqd. Prob.