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There are 9 x 10 x 10 x 10, or 9000 four-digit number that can be formed if the leading digit cannot be zero.

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βˆ™ 2011-05-16 02:16:09
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Q: How many four-digit numbers can be formed if the leading digit cannot be zero?
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How many different 5 digit numbers can be formed from the digits 0 to 9?

100000 - including numbers with leading 0s

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