Question

Three coins are tossed, the probability that at least one tail is :

• A. $\frac{2}{3}$
• B. $\frac{7}{8}$
• C. $\frac{3}{8}$
• D. $\frac{1}{2}$

Answer 1

The correct option is B $\frac{7}{8}$

For at least one tail, we have to exclude the all Heads {H, H,H} and rest 7 are favourable.

$SoP=\frac{7}{8}$