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From the set of all families having three children, a family is picked at random If the eldest child happens to be a girl, find the probability that she has two brothers. |
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Answer» Solution :A family is picked up at RAMDOM from a set of families having 3 CHILDREN. The eldest child happens to be a GIRL. We have to find the probability that she has two brother. LET G denotes a girl and B denotes a boy. `therefore P (B)=1/2,P(G)=1/2` P (BB | G ) =P(B) xx P (G)=1/2xx1/2=1/4` |
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