- Combinatorics. Combinations, arrangements and permutations
This calculator calculates number of combinations, arrangements and permutations for given n and m

- Combinatorics. Generator of combinations.
Combinatorics. Generator of combinations of m from n.

This calculator randomly picks several numbers from specified range.

- Factoring calculator
This calculator generates all pairs of factors for given integer.

- Generator of combinations which satisfy a condition
For elements with weights this calculator can filter out all combinations where total weight is under the specified limit.