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Probability Calculator

Calculate probability, permutations & combinations

P(A) = Favorable Outcomes / Total Outcomes
Formula Reference
Probability
P(A) = n(A) / n(S)
Permutation
P(n,r) = n! / (n-r)!
Combination
C(n,r) = n! / r!(n-r)!
Factorial
n! = n×(n-1)×...×1