Question

The proability of having at least one tail in $4$ throws with a coin is

• A. $15/16$
• B. $1/16$
• C. $1/4$
• D. $1$

Answer 1

The correct option is A $15/16$

The probability of no tail in $4$ throws of a coin.
$=\left(1/2\right)\times \left(1/2\right)\times \left(1/2\right)\times \left(1/2\right)=1/16.$
Hence the probability of at least one tail in
four throws $=1-\left(1/16\right)=15/16.$