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Question Number 19935 by tawa tawa last updated on 18/Aug/17

Which of the following points is a convex combination of (2, − 5, 0) and  and (− 4, 2, 4) in R^3   (a)  (0, 6, 1)  (b) (− 4, − 2, 5)  (c) (− 1, 0, 4)  (d) (− 2, − (1/3), (8/3))  (e) None of the above

$$\mathrm{Which}\:\mathrm{of}\:\mathrm{the}\:\mathrm{following}\:\mathrm{points}\:\mathrm{is}\:\mathrm{a}\:\mathrm{convex}\:\mathrm{combination}\:\mathrm{of}\:\left(\mathrm{2},\:−\:\mathrm{5},\:\mathrm{0}\right)\:\mathrm{and} \\ $$$$\mathrm{and}\:\left(−\:\mathrm{4},\:\mathrm{2},\:\mathrm{4}\right)\:\mathrm{in}\:\mathbb{R}^{\mathrm{3}} \\ $$$$\left(\mathrm{a}\right)\:\:\left(\mathrm{0},\:\mathrm{6},\:\mathrm{1}\right) \\ $$$$\left(\mathrm{b}\right)\:\left(−\:\mathrm{4},\:−\:\mathrm{2},\:\mathrm{5}\right) \\ $$$$\left(\mathrm{c}\right)\:\left(−\:\mathrm{1},\:\mathrm{0},\:\mathrm{4}\right) \\ $$$$\left(\mathrm{d}\right)\:\left(−\:\mathrm{2},\:−\:\frac{\mathrm{1}}{\mathrm{3}},\:\frac{\mathrm{8}}{\mathrm{3}}\right) \\ $$$$\left(\mathrm{e}\right)\:\mathrm{None}\:\mathrm{of}\:\mathrm{the}\:\mathrm{above} \\ $$

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