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Complex Numbers
medium
0:00.0
Evaluate
∑
k
=
1
4
i
k
\sum_{k=1}^{4} i^k
∑
k
=
1
4
i
k
.
A
1
1
1
B
i
i
i
C
0
0
0
D
−
1
-1
−
1
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