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Find the sum of all 5-digit re-arrangement of the digits 1, 2, 3, 4, 5.

 May 10, 2020
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The five numbers: 1, 2, 3, 4, 5, give: 5! = 120 permutations. Since each permutation sums up to: 1+2+3+4+5=15. So 15 x 120 =1,800 - the sum of all 120 arrangements.

 May 10, 2020

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