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If a(n) = 3-4n, then what is a(1)+a(2)+a...

If `a_(n) = 3-4n`, then what is `a_(1)+a_(2)+a_(3)+…+a_(n)` equal to ?

A

`-n(4n-3)`

B

`-n (2n-1)`

C

`-n^(2)`

D

`-n(2n+1)`

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