a number is choosen at random from Frist 25 natural numbers find the probability that the number is not a prime
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the ans. will be
S= ( 1,2,3,4,5,6,7,8.....25)
n(S) = 25
event A is the no. is not a prime no.
A = (4,6,8,9,10,12,14,15,16,18,20,21,22,24,25)
n(A)=15
p(A) = n(S)÷ n(A)
= 25 ÷ 15 = 5 ÷ 3
the ans will be 5 /3
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