Combination Calculator (nCr)
Combination Calculator (nCr): a planned Super Calculator tool. Covers total items n, items chosen r and repetition allowed. Stub page. Not published yet.
Combination Calculator (nCr) is a planned calculator in the mathematics section of Super Calculator, covering statistics and probability.
What this calculator will compute
Inputs: total items n, items chosen r and repetition allowed.
Outputs: number of combinations, full expression, Pascal triangle position and probability of one specific combination.
Formula, recorded as scope and not yet verified against a primary source: C(n, r) = n! / (r!(n-r)!). Combinations with repetition give C(n + r - 1, r). Compute multiplicatively rather than by three factorials to avoid overflow.
Status
This page is a stub. The calculator is not built, no figure on this page has been verified against the authority that sets it, and nothing here should be used to make a decision. The page exists so that the site structure is complete and so that articles can link this concept on first mention.
The stub carries noindex, nofollow and is excluded from the sitemap.