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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 has a number which is a multiple of 3 or 5?
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multiples of 3 = 3;6;9;12;15;18 = 6 numbers

multiples of 5 = 5;10;15;20 = 4 , but 15 is a multiple of both 3 and 5 so we have 3 numbers ,

Total probability = 6/20 + 3/20

= 9/20
by Diamond (44,680 points)
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Hi, I don't understand where 3/20 comes from. Can you explain further?

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