1.

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.

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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