Question

When two coins are tossed together, what is the probability of getting at least one tail?

• A. $\frac{3}{4}$
• B. $\frac{1}{8}$
• C. $\frac{3}{8}$
• D. $\frac{1}{4}$

Answer 1

Answer: (A)

$\frac{3}{4}$

When two coin are tossed together, there are four equally likely outcomes. i.e.,
$S=\{HH,HT,TH,TT\}$
The outcomes having at least one tail are HT, TH and TT, i.e., 3.
$\therefore P$ (at least one tail)$=\frac{3}{4}$