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Question
From 25 identical cards, numbered 1, 2, 3, 4, 5, ……, 24, 25: one card is drawn at random. Find the probability that the number on the card drawn is a multiple of 5.
Solution
There are 25 cards from which one card is drawn.
Total number of elementary events = n(S) = 25
From number 1 to 25, there are 5 number which are multiple of 5 i.e. {5, 10, 15, 20, 25}
Favorable number of events = n(E) = 5
Probability of selecting cards with a multiple of 5 = `(n(E))/(n(S)) = 5/25 = 1/5`
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