Q 1119356219.     Prove that `2^k((n),(0))((n),(k))−2^(k−1)((n),(1))((n−1),(k−1))+2^(k−2)((n),(2))((n−2),(k−2)) −⋯+(−1)^k((n),(k))((n−k),(0)) = ((n), (k))` where `((m), (r) ) = text()^mC_r`

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