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AnPrnCr 289

A nCrnPr/r!

nCr .

nCrnr001

nCrnr OFF1.Alt+Shift+=2._n.

nCr30 ...

nPrnCr... nrnCrnrr.

A nCrnPr/r!

nPr,nCrrnnumber PpermutationCcombination

nCrnr nr 1n.