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nCr/nPr, coin flip odds, dice sum distribution, and card draw probability.
Calculate combinations (nCr) and permutations (nPr) with exact big-integer precision, plus real-world probability scenarios: binomial probability for coin flips, the full sum distribution for rolling multiple dice, and hypergeometric probability for card draws without replacement.
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Combinations · C(n, r) — order doesn't matter
120
Permutations · P(n, r) — order matters
720