Probability Calculator

Find probability, odds, and combinatorial values.

CALCULATE

P = favorable / total

Probability ranges from 0 (impossible) to 1 (certain).

C(n,r) = n! / (r!(n-r)!)

Order doesn't matter

P(coin heads) = 1/2. P(card ace) = 4/52. P(dice 6) = 1/6. Combinations: choosing 3 from 10 = 120 ways. Permutations (order matters): 10P3 = 720.

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