A bag contains 25 cards numbered from 1 to 25. A card is drawn at random from the bag. Find the probability that the number on the drawn card is
a) Divisible by 3 or 5.
b) Aperfectsquarenumber.
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Cards contains number from 1 to 25
n(C)=25
a)Divisible by 3 or 5
let A be the number of cards divisible by 3 or 5 from 1 to 25
A=(3, 5, 6, 9, 10, 12, 15, 18, 20, 21, 24, 25)
n(A)=12
p=probability
p(A)=n(A)/ n(C)
= 12/25
b)A perfect square
let B be the set of perfect square from 1 to 25
B= ( 1, 4, 9, 16, 25)
n(B)= 5
p(B)= n(B) / n (A)
= 5/ 25
=1/5
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