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[sum(r=0)^(m)^(n+r)C(n)=],[[" (1) "^(n+m...

[sum_(r=0)^(m)^(n+r)C_(n)=],[[" (1) "^(n+m+1)C_(n+1)," (2) "^(n+m+2)C_(n)]]

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