If triangler=|[2^r,1/((r+1)(r+2)),r],[a,...

If `triangle_r=|[2^r,1/((r+1)(r+2)),r],[a,b,c],[2^(n+1) -1,(n +1)/(n +2),(n(n +1))/2]|`, then `sum_(r=0)^n triangle_r` is equal to :

A

0

B

1

C

-1

D

none of these

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