There are 24 four-digit numbers that can be formed by permuting 3, 5, 7, and 9. What is the sum of all these numbers?

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- April 18th 2014, 04:17 PM #1

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- April 18th 2014, 04:42 PM #2

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## Re: Need Help.

- April 18th 2014, 04:53 PM #3

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