WAEC - Mathematics (2002 - No. 25)
A number is selected at random from the set Y = {18, 19, 20, . . . 28, 29}. Find the probability that the number is prime.
\(\frac{1}{4}\)
\(\frac{3}{11}\)
\(\frac{1}{2}\)
\(\frac{3}{4}\)
Explicação
Y = {18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29}
Number of prime numbers = 3
Prob(picking a prime number) = \(\frac{3}{12}\)
= \(\frac{1}{4}\)