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[" 21."sum(r=0)^(m)r'''C(r)3'(-2)^(10-r)...

[" 21."sum_(r=0)^(m)r'''C_(r)3'(-2)^(10-r)=...],[[" (A) "10," (B) "20," (C) "30," (D) None of these "]]

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