Fifty Raffle Tickets Are Numbered 1 Through 100, and One

Short Answer

Fifty raffle tickets are numbered 1 through 100, and one of them is drawn at random. What is the probability that the number is a multiple of 9 or 8? Consider the following "solution": Since 11 tickets bear numbers that are multiples of 9 and 12 tickets bear numbers that are multiples of 8, we conclude that the required probability is
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Is this solution right? Answer right or wrong.
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What is the correct answer?
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