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As the number has to start with 15, we have only 3 remaining digits to work with. There are 3 possible options for the first digit. Then out of each of these, 2 possible options for the second digit, and one option for the last. This means that in total there are 3x2x1 (6) possible combinations. These are:

15234

15243

15324

15342

15423

15432

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Q: What are all of the possible numeric combinations using 1-5 starting with 15?
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