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Complex Numbers
medium
0:00.0
For which
k
k
k
is
z
=
(
k
+
i
)
(
2
−
i
)
z = (k+i)(2-i)
z
=
(
k
+
i
)
(
2
−
i
)
purely real?
A
1
/
2
1/2
1/2
B
2
2
2
C
−
2
-2
−
2
D
0
0
0
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