Latest Infosys Aptitude Question SOLUTION: there are 7 children and the small one is boy find the probability of 6 boys

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there are 7 children and the small one is boy find the probability of 6 boys

Asked In Infosys samadrita chakraborty (12 years ago)

Unsolved Read Solution (4)

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kalirathinam  (12 years ago)

answer is 1/64.
bcoz probability to the birth of boy or girl is = 1/2
7th one birth is boy.7th probability is 1.
so the probability to to the birth of 6 boys
= (1/2)*(1/2)*(1/2)*(1/2)*(1/2)*(1/2)*1
= (1/2)^6
= (1/64) is the answer

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Ankit  (12 years ago)

so we we to calculate probability of 5 boys in the first 6 boys.
total number of choices are= 2*2*2*2*2*2=64
favorable=bbbbbb,gbbbbb,bgbbbb,bbgbbb,bbbgbb,bbbbgb,bbbbbg=7
so probability is =7/64

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Ankit  (12 years ago)

sorry to say Kalirathinam
But we talk about 6 boys
not 7 boys
that case of 7 boys.

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avanthi  (12 years ago)

ans is 5/64

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