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Two vertices of the parallelogram ABCD a...

Two vertices of the parallelogram ABCD are `A(8,14,12)` and `B(4,6,4)` and its diagonals intersect at (3,5,5) , find the coordinates of vertices C and D.

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The correct Answer is:
`C(-2,-4,-2)` and `D(2,4,6)`
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