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int(x^(6)+7x^(5)+6x^(4)+5x^(3)+4x^(2)+3x...

`int(x^(6)+7x^(5)+6x^(4)+5x^(3)+4x^(2)+3x+1)e^(x)dx` equals

A

`sum_(i=0)^(6)x^(i)e^(x)+C`

B

`sum_(i=1)^(7)x^(i)e^(x)+C`

C

`sum_(i=1)^(6)x^(i)e^(x)+C`

D

`x^(i)e^(x)+C`

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