Q. 255.0( 1 Vote )

Mark the correct A. 5

B. 3

C. 10

D. 12

Answer :

Given:


P(females)=p(males)=1/2


p(x=n-1) =


n=?


p(x=n-1) = nCn-1 pn-1 q1


Since p=q


p(x=n-1)= n pn-1q


=n pn-1p


=npn


=n





comparing LHS anr RHS


we have,


n=12

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