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

[" If "sum_(r=1)^(10)r(r-1)^(10)C_(r)=k*2^(9)," then "k" is equal to "],[[" (A) "10," (B) "45," (C) "90]]

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