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Bagdat210903
@Bagdat210903
July 2022
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а) k!/(k-2)!
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sangers1959
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k!/(k-2)!=(k-2)!*(k-1)*k/(k-2)!=(k-1)*k=k²-k.
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k!/(k-2)!=(k-2)!*(k-1)*k/(k-2)!=(k-1)*k=k²-k.