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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Mark the correct A. 7B. 6C. 5D. 3