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(4 x 3 x 2 x 1) = 24 of them.

If repetition were allowed, then there would be (4 x 4 x 4 x 4) = 256 of them.

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Q: How many four digit whole numbers can you write using the digits 1 2 3 and 4 if no digit appears more than once in each number?
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Sum of the digits of a number equals the number.Generate such numbers?

It appears that only single digit numbers work (0 thru 9)


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