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The number of different combinations

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A combination is the set itself without reference to order.
The number of different combinations of n distinct objects taken r at a time is

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

*** Âü°í¹®Çå[References] ***

NCEES, FUNDAMENTALS OF ENGINEERING SUPPLIED-REFERENCE HANDBOOK, 4th edition
C(n,r) = fac(n) / (fac(r)*fac(n-r))
º¯¼ö¸í Variable º¯¼ö°ª Value º¯ ¼ö ¼³ ¸í Description of the variable


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