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Complex Numbers
medium
0:00.0
Calculate the sum
S
=
∑
k
=
0
3
i
k
S = \sum_{k=0}^{3} i^k
S
=
∑
k
=
0
3
i
k
.
A
i
i
i
B
1
+
i
1 + i
1
+
i
C
0
0
0
D
−
1
-1
−
1
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