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30-10-2015
Mathematics

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How many different two digit numbers can you make using the numbers 3,7,9, and 2 if no digit is repeated within a number?

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30-10-2015

The first digit can be any one of the four. For each of those . . .
The second digit can be any one of the remaining 3 .

The total number of possible arrangements is (4 x 3) = 12 .

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