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Tool to generate combinations with repetitions. In Mathematics, a combination with repetitions is a combinations of items which can be repeated.

Answers to Questions

How to generate combinations with repetition?

Item combinations with repetition consist in generating the list of all possible arrangements of elements (each can be repeated) in any order.

Example: A,B,C items be shuffled in 6 couples of 2 items: A,AA,BA,CB,BB,C, C,C. Without repetition, there would be only 3 couples A,B, A,C et B,C.

The sets of n elements are called tuples: {1,2} or {1,2,3} are tuples.

How to count combinations with repetition?

Counting repeated combinations of k items (sometimes called k-combination) in a list of N is noted \( \Gamma_n^k \) and $$ \Gamma_n^k = {n+k-1 \choose k} = \frac{(n+k-1)!}{k! (n-1)!} $$

The number of combinations with repeats of \( k \) items among \( N \) is equal to the number of combinations without repeats of \( k \) items among \( N + k - 1 \).

How to remove the limit when computing combinations?

The calculation of the combinations generates an exponential number of values which require large calculation servers, generations have therefore a cost.

Source code

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