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Let p(x) = x + 2x-3, q(x) = 2x-3x+4, r(x) = kx-1. For what value of k are the vectors p, q, r in

Let p(x) = x + 2x-3, q(x) = 2x-3x+4, r(x) = kx-1. For what value of k are the vectors p, q, r in P linearly dependent?

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