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7.9 B, B, C are 'the mid-points of the sides AP, PQ, QA of AAPQ If a, .b, c are the position vectors of

7.9 B, B, C are 'the mid-points of the sides AP, PQ, QA of AAPQ If a, .b, c are the position vectors of the points A, B, C, prove that the position vectors of P, Q, R are 2b 2c a, b + c a respectively. a,

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