The number of different ways that you can arrange 15 different items is given by the permutations of 15 things taken 15 at a time. That is 15 factorial, or 1,307,674,368,000.
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you can arrange 8 pictures 28 different ways
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There are six different ways to arrange the letters XYZ... XYZ XZY YXZ YZX ZXY ZYX