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Assume that in a family, each child is e...

Assume that in a family, each child is equally likely to be a boy or girls .A family with three children is is choosen at random. The probability that the eldest child is a girls given that the family has at least one girls is

A

`1/2`

B

`1/3`

C

`2/3`

D

`4/7`

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The correct Answer is:
D
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