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21. The vertices of a quadrilateral are A = [0, 3, 5], B = [-3, -1, 17], C = [4, -3, 15] & D =

21. The vertices of a quadrilateral are A = [0, 3, 5], B = [-3, -1, 17], C = [4, -3, 15] & D = [7, 1, 3]. Prove that ABCD is a parallelogram. [5 Marks]

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