What is the probability that an integer selecte... - WAEC Mathematics 1993 Question
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
correct option: a
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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