Show that the points `A (1, 2, 3), B (–1, –2, –1), C (2, 3, 2)` and `D (4, 7, 6)` are the vertices of a parallelog

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Q 3019345219.     Show that the points `A (1, 2, 3), B (–1, –2, –1), C (2, 3, 2)` and `D (4, 7, 6)` are the vertices of a parallelogram ABCD, but it is not a rectangle.

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