[" The value of "(1)/(n!)+(1)/((n+1)!)+(...

[" The value of "(1)/(n!)+(1)/((n+1)!)+(1)/((n+2)!)=],[[(n^(2)+n+11)/((n+1)!)," b) "(n^(2)+4n+5)/((n+2)!)," c) "(n^(2)+6n+3)/((n+1)!)," d) "(n^(2)+6n-3)/((n+1)!)]]

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[" The value of "(1)/(n!)+(1)/((n+1)!)+(1)/((n+2)!)=],[[(n^(2)+n+11)/(...
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