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Combinations

TOP/Collection of Mathematical Formulas/Permutations and Combinations
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Calculates nCr, the number of combinations of r items chosen from n distinct items.
Original number n
n≧r≧0
Number to select: r
Number of combinations nCr  
\(\normalsize Combinations\\ (1)\ {}_nC_r=\binom{ n }{ r }={\large\frac{n!}{r!(n-r)!}}\\ (2)\ {}_nC_r={\large\frac{{}_nP_r}{r!}}\\ \)

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