Mark the correct alternative in the following: A coin is tossed n times. The probability of getting at least once is greater than 0.8. Then, the least value of n, is

Question

Philoid · Accepted Answer

Given:

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

P(H)= H¹T^n-1+H²T^n-2+H³T^n-3+…..+H^n-1T¹+Hⁿ

Required probability = p= 1-

P0.8

For n= 2

For n=3

So, n=3

Mark the correct alternative in the following:A coin is tossed n times. The probability of getting at least once is greater than 0.8. Then, the least value of n, is

Mark the correct alternative in the following:
A coin is tossed n times. The probability of getting at least once is greater than 0.8. Then, the least value of n, is