Question

What is the probability of getting no heads in three tosses?

Answer 1

Calculate the probability of getting no heads when $3$ coins are tossed.

Probability of getting no heads means there should not be a single head, and all tails should be there.

Total number of outcomes $=2^3=8$.

Favorable outcomes $\left\{\mathrm{TTT}\right\}=1$

Probability of getting no heads $=\frac{\mathrm{Favorable}\mathrm{outcomes}}{\mathrm{Total}\mathrm{outcomes}}$

$\mathrm{P}=\frac{1}{8}$

Hence, the probability of getting no heads when $3$ coins are tossed is $\frac{1}{8}$.