JAMB 1988 · UME · Q50

If two dice are thrown together, what is the probability of obtaining a score of at least 10?

Worked solution (try it first)

Two dice give 36 equally likely outcomes.
A score of at least 10 means 10, 11 or 12: $(4, 6), (5, 5), (6, 4)$ , then $(5, 6), (6, 5)$ , then $(6, 6)$ .
That is 6 outcomes.
So the probability is $\frac{6}{36} = \frac16$ , option A.