sum of (k-1)(k-2)(k-3)(k-4)(k-5)(k-6)(k-7)(k-8)(k-9)(k-10)/(10!*4^k) k=1 to infinitysum of (k-1)(k-2)(k-3)(k-4)(k-5)(k-6)(k-7)(k-8)(k-9)(k-10)/(10!*4^k) k=1 to infinity

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