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Complex Numbers
easy
0:00.0
What is
z
⋅
z
ˉ
z \cdot \bar{z}
z
⋅
z
ˉ
for
z
=
2
+
i
z = 2 + i
z
=
2
+
i
?
A
5
5
5
B
3
3
3
C
4
4
4
D
−
3
-3
−
3
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