Question

Two unbiased coins are tossed simultaneously. Find the probability of getting at most one head.

• A. $\frac{1}{2}$
• B. $\frac{1}{4}$
• C. $\frac{3}{4}$
• D. $\frac{1}{3}$

Answer 1

Answer: (C)

$\frac{3}{4}$

If two unbiased coins are tossed simultaneously, then the sample space will be $S$.
$S:\{HH,HT,TH,TT\}$
$n\left(S\right)=4$

$E:$ Atmost one head is obtained

$\{TT,HT,TH\}$

$n\left(E\right)=3$

Hence, $P($Amost one head$)=$ $\frac{3}{4}$