Using the digits 2 through 9, find the number of different 7-digit numbers such that: Digits can be used more than once. Preview Digits cannot be repeated, but can come in any order. Preview Digits cannot be repeated and must be written in increasing order. Preview
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For each of the 7 digits, we have 10 choices (0 through 9). Therefore, the total number of possible 7-digit numbers is 10^7 = 10,000,000. Show more…
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