Tickets number 1 to 20 are Best up and then a ticket is drawn at random what is the probability that the ticket drawn has a number which is multiple of three or five
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If there's a word "either multiple of 3 or 5" then 6/20 + 4/20 - 1/20 =9/20 is the answer." For this problem: 6/20 + 4/20 = 1/2 only.
Missing: Best | Must include: Best
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Answer:9/20
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