The numbers that go into 45 are 1, 5, 9, 45
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9,5
If you have a set of 45 numbers, then there is one combination that includes all 45 numbers and 45! = 45 x 44 x 43 x ... x 2 x 1 ≈ 1.19622 x 1056 permutations (ways of ordering) all 45 numbers.
1,3,5,9,15,45
1, 90, 30, 3, 2, 5, 18, 45
3 and 5