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11 February, 09:09

How many two digit positive integers can be formed from the digits 1, 3, 5, and 9, if no digit is repeated?

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  1. 11 February, 10:05
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    The answer is 12

    All possible units are 13, 15, 19, 31, 35, 39, 51, 53, 59, 91, 93, 95
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