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Linear Systemshard
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For which value of aaa is the vector v=(1,2,a)v = (1, 2, a)v=(1,2,a) in the span of u1=(1,0,1)u_1 = (1, 0, 1)u1​=(1,0,1) and u2=(0,1,1)u_2 = (0, 1, 1)u2​=(0,1,1)?