1.

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

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



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