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:
3 or 5
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Solution
There are 25 cards from which one card is drawn
Total number of elementary events=n(s)=25
From numbers 1 to 25, there are 12 numbers which are multiple of 3 or 5 i,e {3,5,6,9,10,12,15,18,20,,,21,24,25} favourable number of event n(E) =12
Probability of selecting card with a multiple of 3 or 5
`(n(E))/(n(s))=12/25`
Concept: Type of Event - Complementry
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