UGC NET Paper 1 GA 2007 Dec Solved Paper

Question : 34 of 50

Marks: +1, -0

Mary has three children. What is the probability that none of the three children is a boy?

Solution:

Total cases for each of the there children
(boy or girl in each = 2×2×2 = 8 cases)
There is only one case in which all 3 are girls.
(or none of three is a boy)
So, required probability (none of a boy)

= 1/8

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