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A couple decides to have 4 children. If they succeed in havi

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Re: A couple decides to have 4 children. If they succeed in havi  [#permalink]

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New post 10 May 2018, 10:52
Answer: A.[/quote]
Bunuel Pls explain (1/2)^4?[/quote]

2 girls and 2 boys (4 children) each having the probability of 1/2, so 1/2*1/2*1/2*1/2 = (1/2)^4.[/quote]

Bunuel I am sorry for not asking the question properly.
I understood the concept of (1/2)^4 but meant to ask why is 4!/2!2! not sufficient to solve the answer? Why do we have to add (1/2)^4 to the expression?
Kindly explain elaborately. :angel:[/quote]


The (1/2)^4 or 2^4 represents the total number of possibilities. You do 1/2 essentially because it is the denominator (success/total outcomes)
Re: A couple decides to have 4 children. If they succeed in havi &nbs [#permalink] 10 May 2018, 10:52

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