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Tickets numbered from 1 to 20 are mix...

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

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

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Tickets numbered from 1 to 20 re 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?

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