Question

When a fair coin is tossed nine times,find the probability of getting head atleast once

Answer 1

$$\begin{gathered} \mathrm{Hi}, \\ \mathrm{Probabilitgy}\mathrm{of}\mathrm{getting}\mathrm{atleast}1\mathrm{head}=1-\mathrm{all}\mathrm{tail} \\ =1-\mathrm{TTTTTTTTT} \\ =1-\frac{1}{2^9} \\ =\frac{511}{512} \\ \mathrm{Regards} \end{gathered}$$