Question

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

• A. $\frac{1}{2}$
• B. $\frac{1}{4}$
• C. $\frac{3}{4}$
• D. None of these

Answer 1

The correct option is C $\frac{3}{4}$

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

$E:$ At least one head is obtained

$\{HH,HT,TH\}$

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

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