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If n is a positive integer, how many 4-tuples of integers from 1 through n can be formed in which the elements of the 4-tuple

If n is a positive integer, how many 4-tuples of integers from 1 through n can be formed in which the elements of the 4-tuple are written in increasing order but are not necessarily distinct? In other words, how many 4 tuples of integers (x1, x2, x3, x4) are there with 1 x1 x2 x3 x4 n.

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