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A number is selected at random from the set Y = {18, 19, 20, ....

Mathematics
WAEC 2002

A number is selected at random from the set Y = {18, 19, 20, . . . 28, 29}. Find the probability that the number is prime.

  • A. \(\frac{1}{4}\)
  • B. \(\frac{3}{11}\)
  • C. \(\frac{1}{2}\)
  • D. \(\frac{3}{4}\)
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Correct Answer: Option A
Explanation

Y = {18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29}

Number of prime numbers = 3

Prob(picking  a prime number) = \(\frac{3}{12}\)

= \(\frac{1}{4}\)

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