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If (1+2x+3x^(2))^(10)=a(0)+a(1)x+a(2)x^(...

If `(1+2x+3x^(2))^(10)=a_(0)+a_(1)x+a_(2)x^(2)+a_(3)x^(3)+ . . .+a_(20)x^(20),` then

A

`a_(1)=20`

B

`a_(2)=210`

C

`a_(4)=8085`

D

`a_(20)=2^(2).3^(7).7`

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A, B, C
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