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The value of sum(r=1)^(15)(r2^r)/((r+2)!...

The value of `sum_(r=1)^(15)(r2^r)/((r+2)!)` is (a).`((17)!-2^16)/((17)!)` (b). `((18)!-2^(17))/((18)!)` (c). `((16)!-2^(15))/((16)!)` (d). `((15)!-2^(14))/((15)!)`

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