In a family of three children, find the probability of having at least two
boys.
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Given :
A family of 3 children
To Find :
The probability of having at least one boy is ?
Solution:
Probability of boy =
Probability of girl =
We are supposed to find In a family of 3 children , the probability of having at least one boy
Probability of having at least one boy = 1- Probability of having no boy
Probability of having at least one boy = 1- P(No boy)
Probability of having at least one boy = 1- P(All girls)
Probability of having at least one boy =
Probability of having at least one boy =
Probability of having at least one boy =
Hence the probability of having at least one boy is 1/7
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