find the probability in a family of 4 children.there will be :
a).at least 1 boy.
b).at least 1 boy & a girl.
ans: (a).15/16,(b).7/8.
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Help please
Replies (4)
a) No boy probability = (1*1*1*1)/ (2*2*2*2)= 1/16
Atleat one boy = 1-1/16 = 15/16
but 2nd answer how will you calculate ?-----------------------------
b) in a above there includes a chance that there can be 4 boys
So, if we reduce this probability of getting 4 boys that is 1/16 out of a), then there will atleast be one girl & one boy = 15/16 - 1/16 = 14/16= 7/8
thank u so much.*************
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