# math

Point T is the midpoint of a straight line AB. Given the position vectors of A and T are i - j + k and 2i + 1 ½ k respectively, find the position vector of B in terms of i, and k

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1. T = A+(B-A)/2 = (A+B)/2
B = 2T-A

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2. so B = (3, 1, 2)

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