What is the probability, that a number selected from 1, 2, 3, …, 25, – InterviewSolution

1.

What is the probability, that a number selected from 1, 2, 3, …, 25, is a prime number, when each of the numbers is equally likely to be selected.

Answer»

S = { 1, 2, 3, ---- , 25} |S|= 25

And E = { 2, 3, 5, 7, 11, 13, 17, 19, 23 } |E|= 9

Hence P(E) = |E| / |S| = 9 / 25.

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