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JAMB 1999 · UME · Q42

A number is selected at random from 0 to 20. What is the probability that the number is an odd prime?

Worked solution (try it first)
  1. From 0 to 20 inclusive there are 21 numbers.
  2. The odd primes are 3, 5, 7, 11, 13, 17, 19, which is 7 numbers.
  3. So the probability is 721=13\frac{7}{21} = \frac13, option B.

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