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in Matrices & determinants by (41.4k points)

Let A = [(1, 0, 0), (2, 1, 0), (3, 2, 1)]. if u1 and u2 are column matrices such that Au1 = [1, 0, 0] and Au2 = [0, 1, 0], then u1 + u2 is equal to

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Answer is (D) [1, -1, -1]

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