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

[" If "sum_(1=1)^(10)r(r-1)^(10)C_(r)=k.2^(9)," then "k" is equal to "],[[" (a) "10," (b) "45," (c) "90," (d) "100]]

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