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[" Coefficient of "x^(2)-7" in the expan...

[" Coefficient of "x^(2)-7" in the expansion of "(x+3)^(n)+(x+3)^(n-1)(x+2)+(x+3)^(n-2)(x+2)^(2)+...+(x+2)^(2)],[[" (A) "m+C_(2)(3)," (B) "n-1C_(2)(5)," (C) "n+1C_(2)(5)," (D) "^(n)C_(2)(5)]]

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