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combination formula explained. So some of the permutations would be ABC ACB BAC BCA CAB and CBA. N - r where n represents the total number of items and r represents the number of items being chosen at a time.
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N - r where n represents the total number of items and r represents the number of items being chosen at a time. In general if there are n objects available. Where n P r is the formula for permutations of n objects taken r at a time.
You can always look up the formulas if you forget them.
Picking a President VP and Waterboy from a group of 10. Coefficient of x r in 1 x n n r 1 C r. Coefficient of x r in 1 x x 2 x r n. The number of combinations of n distinct objects taken r at a time when any object may be repeated any number of times.
