Question: Prove that the line joining the points (2, 3, 4) and (1, 2, 3) is perpendicular to the line joining the points (1, 0, 2)

Prove that the line joining the points (2, 3, 4) and (1, 2, 3) is perpendicular to the line joining the points (1, 0, 2) and (2, 3, –2).

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