The combinations of this is 6 but can't figure out the permutation?
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The combinations of 3 out of 4 digits are: 3, 5, 7; 3, 5, 9; 3, 7, 9; 5, 7, 9.

For each of these combinations there are 6 permutations, so in all there are 4 times 6=24 permutations. 

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