18. Relative to a fixed origin O, the points A, B and C have position vectors given respectively by i+j, -2i+k, and 2 i + j+3k. (a) State the vector equation of line OC. (b) If the point P lies on the

18. Relative to a fixed origin O, the points A, B and C have position vectors given respectively by i+j, -2i+k, and 2 i + j+3k. (a) State the vector equation of line OC. (b) If the point P lies on the line OC such that PA PB has the minimum value, find the coordinates of P.

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18. Relative to a fixed origin O, the points A, B and C have position vectors given respectively by i+j, -2i+k, and 2 i + j+3k. (a) State the vector equation of line OC. (b) If …

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