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If a(n) = n(n!) , then what is a1 +a2 +a...

If `a_(n) = n(n!) `, then what is `a_1 +a_2 +a_3 +......+ a_(10)` equal to ?

A

`10 ! -1`

B

`11 ! +1`

C

`10! +1`

D

`11!-1`

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