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[" If "sum(f=1)^(1)r(r-1)^(10)C(r)=k*2^(...

[" If "sum_(f=1)^(1)r(r-1)^(10)C_(r)=k*2^(@)," then "k" is cquarto "],[[" (A) "10," (B) "45," (C) "90]]

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