In a family of 3 children the probability of having at least one boy
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In probability ‘at least’ is specific term where we have to calculate probabilities of all occurrence of an event starting from ‘minimum’ number till ‘maximum’ number .
As an example , in this question we have to find :
Probability of at least 1 boy is = Probability of one Boy + Probability of two Boys + Probability of all three Boys
Probability of all three Boys = (1/2)*(1/2)*(1/2) = 1/8
Probability of two Boys = (1/2)*(1/2) = 1/4
Probability of one Boy = 1/2
Probability of at least one boy = 1/2 + 1/4 + 1/8 = 7/8
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