find the probability tht a no. selected at random from the numbers 1 to 25 is not a prime number when each of the given numbers is equally likely to be selected.
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prime number
number that is divisible only by itself and 1 (e.g. 2, 3, 5, 7, 11).
prime number BTW 1 and 25 = 2,3,5,7,11,13,17,19,23
number = 10
P(not prime no) = 1 - P(prime no) = 1 - 10/25
= 1 - 2/5 = 3/5
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