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Calculus Level 3

\(\frac { \sum _{ n=1 }^{ \infty }{ \frac { { n }^{ 2 }\left( n-1 \right) }{ { 2 }^{ n } } } }{ \sum _{ n=1 }^{ \infty }{ \frac { { n }\left( n-1 \right) }{ { 2 }^{ n } } } } \)

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