Permutations & Combinations — Free Online (Tolyo.app)
nPr and nCr for counting problems.
Permutations & Combinations
TrendingNo repetition
Permutations (nPr)
order matters720
nPr = n × (n−1) × … × (n−r+1)
Combinations (nCr)
order doesn’t matter120
nCr = n! / (r! (n−r)!)
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