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what is the formula for ncr. More formally the number of k-element subsets or k-combinations of an n-element set. Both clockwise and anti clockwise rotations are considered.
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A binomial coefficient Cn k also gives the number of ways disregarding order that k objects can be chosen from among n objects. Both clockwise and anti clockwise rotations are considered. You can use this formula and try and prove the question binomnrbinomnr-1binomn1r Where nCrbinomnr.
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The permutations formula is Pnr n. The formula to find combinations. Enter r then press. In the following examples we list the exact key sequence used to find the answer.
