Q. 84.0( 2 Votes )

Mark the correct A. 7, 14

B. 10, 14

C. 12, 7

D. 14, 12

Answer :

Given:


P(H)=1/2=p


q=1/2


P(x=r)= nCr pr qn


P(x=4)= nC4 p4 qn-4 = nC4 pn


P(x=5)= nC5 p5 qn-5 = nC5 pn


P(x=6)= nC6 p6 qn-6 = nC6 pn


Since they are in AP;


So,


p(x=5)=


2 p(x=5) = p(x=4)+ p(x=5)


2nC5 pn = nC4 pn +nC6 pn







4n – 16 = 55n – 225


51n = 209


n= 4

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