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20. Given a = [8, -6, 4], b = [-2, 1, -3] and c = [7, 6, -2], find a) b . c [2 marks]

20. Given a = [8, -6, 4], b = [-2, 1, -3] and c = [7, 6, -2], find a) b . c [2 marks] b) a x c [2 marks] c) 0, the angle between a and c [3 marks] d) projab [3 marks] e) Are the vectors a, b and c coplanar? Show your answer algebraically. [3 marks]

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