JAMB 2010 · UTME · Q50

If three unbiased coins are tossed, find the probability that they are all heads.

Worked solution (try it first)

Each coin shows a head with probability $\frac12$ , and the coins are independent.
Multiply for the three coins: $\frac12 \times \frac12 \times \frac12 = \frac18$ , option A.