A number is selected from the set 1,2,3,......,20 the probability that the selected number is divisible by 3 or 4 .
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S={1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20}
n(S)= 20
Let A be the event that the selected number is divisible by 3 or 4
A={3 4 6 8 9 12 15 20}
n(A)=8
P(A)= n(A)/n(S)
= 8/20
= 2/5
Therefore the probability
that the selected number is divisible by 3 or 4 is
2/5
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