This is a Permutation problem; nPr. This is: n!/(n-r)! or 45!/(45-5)! = 146611080.
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3944 the true answer is 145 combinations but 3,944 sequences!
There are infinitely many pairs of numbers that can be multiplied to make 145. For example, 1*145, 10*14.5, 100*1.45, 5*29
1 x 145, 5 x 29, 29 x 5, 145 x 1.
The factors of 145 are 1, 5, 29, and 145.
29•5=145