Minimum number of times a fair coin must be tossed so that the probability of getting at l…

Question

Minimum number of times a fair coin must be tossed so that the probability of getting at least one head is
more than 99\% is :

Accepted Answer

$$1 - {\left( {{1 \over 2}} \right)^n} > {{99} \over {100}}$$

$${\left( {{1 \over 2}} \right)^n} < {1 \over {100}}$$

$$ \Rightarrow $$ n = 7

Solutions · 1