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If (1+2x+3x^2)^10=a0+a1x+a2x^2+……..+a20x...

If `(1+2x+3x^2)^10=a_0+a_1x+a_2x^2+……..+a_20x^20` then (A) `a_1=20` (B) `a_2=210` (C) `a_3=1500` (D) `a_20=2^3.3^7`

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