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WAEC 2023 · Paper 1 · Q41

A number is chosen at random from 40 to 50 inclusive. Find the probability that the number is prime.

Worked solution (try it first)
  1. From 40 to 50 inclusive there are 11 numbers.
  2. The primes among them are 41, 43 and 47.
  3. 49 is 7×77 \times 7.
  4. So the probability is 311\frac{3}{11}, option A.

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