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Three vertices of a parallelogram are...

Three vertices of a parallelogram are `(a+b ,\ a-b),\ \ (2a+b ,\ 2a-b),\ (a-b ,\ a+b)` . Find the fourth vertex.

A

`(b,b)`

B

`(b,-b)`

C

`(-b,b)`

D

`(-b,-b)`

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