Mark the correct alternative in the following:

The least number of times a fair coin must be tossed so that the probability of getting at least one head is at least 0.8, is

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

1