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There are 90 two digit numbers, 10 through 99. There are 18 two digit numbers containing a 9. They are 19, 29, 39, 49, 59, 69, 79, 89, and 90 through 99. Therefore, there are 72 two digit numbers that do not contain a 9.

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โˆ™ 2009-07-07 01:40:26
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Q: How many two-digit numbers do not contain the number 9?
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