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. \(\frac{3}{4}\)
Correct Answer: A. \(\frac{1}{4}\)
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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