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The value of s u msum(n=1)^(13)(i^n+i^(...

The value of `s u msum_(n=1)^(13)(i^n+i^(n+1)),"w h e r e"i=sqrt(-1)"e q u a l s"` `i` (b) `i-1` (c) `-i` (d) `0`

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