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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

Question

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## Answers ( )

Answer:Let S be the set of numbers from 1 to 25.

n(S)=25Let 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