1 Answered Questions for the topic Discrete Math, R-combinations, Repetition

Discrete math, r Combinations, repetition

11/21/15

if n is a positive integer, how many 4-tuples can be created from integers 1 through n where the elements are in increasing order but not necessarily distinct

in other words, how many 4-tuples of integers (i,j,k,m) are there with 1<=I<=j<=k<=m<=n? I know I need r-combinations with repetition allowed.

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