Determine whether the points lie on a straight line. (a) A(2, 6, 1), B(3, 10, -1), C(1, 4, 2) O Yes, they do lie on a straight line. O No, they do not. (b) D(0, -5, 4), E(1, -3, 2), F(3, 1, -2) O Yes, they do lie on a straight line. O No, they do not.

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