Thirty identical cards are marked with numbers 1 to 30. If one card is drawn at random, find the probability that it is:
a multiple of 4 or 6
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Solution
There are 30 cards from which one card is drawn.
Total number of elementary events =n(s)=30
From numbers 1 to 30, there are 10 numbers which are multiple of 4 or 6 i.e {4,6,8,12,16,18,20,24,28,30} Favourable number of event =10
Probability os selecting a card with a multiple of 4 or 6
`(n(E))/(n(s))=10/30=1/3 `
Concept: Type of Event - Complementry
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