✓ Effortless Math · Practice

Permutations & Combinations Practice

Count arrangements (nPr) and selections (nCr) with fresh auto-generated problems — get instant feedback, step-by-step solutions, and build a streak to mastery.

Arrange (order matters) → nPr = n!/(n−r)!. Choose (order doesn't matter) → nCr = n!/(r!(n−r)!).
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Count the ways

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Type the whole-number count.

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