11. A number is selected from numbers 1 to 25. The probability that it is prime is
(a)2/3
(b)1/6
(c)1/3
(d)5/6
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Answer:
Let S be the set of numbers from 1 to 25.
n(S)=25
Let A be the set of prime numbers from 1 to 25
A={2, 3, 5, 7, 11, 13, 17, 19, 23}
P(A)=n(A)/n(S)
=9/25
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