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Tickets numbered from 1 to 20 are mixed ...

Tickets numbered from 1 to 20 are mixed up together and then a ticket is drawn at random. What is the probability that the ticket has a number which is a multiple of 3 or 7 ?

Text Solution

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A = {3, 6, 9, 12, 15, 18, 7, 14}
`P(A) = (8)/(20) = (2)/(5)`
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