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If the coordinates of the mid points of the sides of a triangle are (1,2) , (0,-1) and (2,-1) . Find the coordinates of its vertices :

A

(7,9), (- 3, - 7), (1, 1)

B

(- 3, - 7), (1, 1), (2, 3)

C

(1, 1), (2, 3), (- 5, 8)

D

None of these

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The correct Answer is:
A
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