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The mid-points of the sides of a triangl...

The mid-points of the sides of a triangle are given by (3, 2, -4), (9, 8, -15) and (5, 4, 6). Find
the coordinates of its vertices.

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The correct Answer is:
`(-1, -2, 17), (7, 6, -25), (11, 10, -5)`
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