What is the probability that a nümber se...

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

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Let .S. be the sample space associated with the giveri experiment and .A. be the event "selecting. a (prime) number": Then, .S:=1,2,3, ldots, 2 dot5. and .A=2,3,5,7,1 cdot 1,13,17,19,23. .therefore . Total number of elementary events .=25. Favourable number of elementary.events: .=.9^circ. . Hence, required-probability

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