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If I solve a least squares problem with 2unknowns, and(Q^T)b = [1 2 3 4]^T, then the 2-norm of my residual is? I believe the

If I solve a least squares problem with 2unknowns, and(Q^T)b = [1 2 3 4]^T, then the 2-norm of my residual is?

I believe the formula for that is the 2-norm ||c - R(11)x(1) - R(12)x(2)||^2, but I don't know how to get those values.

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