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Complex Numbers
hard
0:00.0
Evaluate
∑
k
=
0
3
i
k
\sum_{k=0}^{3} i^k
∑
k
=
0
3
i
k
.
A
1
+
i
1+i
1
+
i
B
i
i
i
C
1
1
1
D
0
0
0
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