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JEE Advance - Mathematics (1983 - No. 35)
The points z
1
, z
2
, z
3
, z
4
in the complex plane are the vertices of a parallelogram taken in order if and only if
z
1
+ z
4
= z
2
+ z
3
z
1
+ z
3
= z
2
+ z
4
z
1
+ z
2
= z
3
+ z
4
None of these
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