Question 1170250: 3.A bowl of raffle tickets contains the numbers 1 through 80. What is the probability that a randomly selected ticket will be a number that is not a multiple of 9?
Answer by greenestamps(13195)   (Show Source):
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Number of cards: 80
Number of cards numbered with numbers that ARE a multiple of 9: 8 (9, 18, 27, ..., 63, 72)
Number of cards that are numbered with numbers that are NOT a multiple of 9: 80-8 = 72
ANSWER: P(card is not a multiple of 9): 72/80 = 9/10 = 0.90 = 90%.
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