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If 1P1+2⋅2P2+3⋅3P3+⋯+15⋅15P15=qPr−s, 0≤s≤1, then q+sCr−s is equal to

Answer» If 1P1+22P2+33P3++1515P15=qPrs, 0s1, then q+sCrs is equal to


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