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What is the probability that an integer selected from the set of integers (20, 21,...

Mathematics
WAEC 1993

What is the probability that an integer selected from the set of integers (20, 21, ...., 30) is a prime number?

  • A. 2/11
  • B. 5/11
  • C. 6/11
  • D. 9/11
  • E. 2/3
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Correct Answer: Option A
Explanation

S = {20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30}

n(S) = 11

P = {23, 29}

n(P) = 2

Prob(P) = \(\frac{2}{11}\)

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