## Combinations (nCr) Calculator

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Find out how many different ways to choose items. For an in-depth explanation of the formulas please visit Combinations and Permutations.

The old Flash version is here. For an in-depth explanation please visit Combinations and Permutations. The "has" rule which says that certain items must be included for the entry to be included.

The "no" rule which means that some items from the list must not occur together. The word "has" followed by a space and a number. Then a comma and a list of combination calculator separated by commas. Will allow if there is an a and bor a and cor b and cor all three a,b and c. The word "no" followed by a space and a number. It has rejected any with a and bor a and cor b and cor even all three a,b and c.

The combination calculator "pattern" followed by a space and a list of items separated by commas. Hide Ads About Ads. Combinations and Permutations Calculator Find out how many different ways to combination calculator items. You can now add "Rules" that will reduce the List: The "pattern" rule is used to impose some kind of pattern to each entry.

Example has 1,a,b,c Will allow if there is an aor bor cor a and bor a and combination calculatoror b and cor all three a,b and c. In other words, it insists there be an a or b or c in the result. Example has 2,a,b,c Will combination calculator if there is an a and combination calculatoror a and cor b and cor all three a,b and c.

In other words, it insists there be at least 2 of a or b or c in the result. Combinations combination calculator Permutations Lotteries.