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 :
Correct Option: , 3
Solution:
$1-\left(\frac{1}{2}\right)^{n}>\frac{99}{100}$
$\Rightarrow\left(\frac{1}{2}\right)^{\mathrm{n}}<\frac{1}{100}$
$\Rightarrow \mathrm{n}=7$