Q. 115.0( 1 Vote )

Mark the correct A. 7

B. 6

C. 5

D. 3

Answer :

Given:


P(atleast 1 head) = 0.8


n=?


p(H)=p(T) = 1/2


Required probability = p= 1-


P0.8





For n= 2



For n=3



So, n=3

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