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If Deltar=abs((2^(r-1),((r+1)!)/(1+1/r),...

If `Delta_r=abs((2^(r-1),((r+1)!)/(1+1/r),4r^3-2nr),(a,b,c),(2^n-1,((n+1)!-1),n^3(n+1))) n in N` then `sum_(r=1)^n Delta_r =`?`

A

`abc`

B

`(n+3)!`

C

0

D

`a(n!)+b.2^n+c`

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