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The lines (x-20/1=(y-3)/1=(z-4)/(-k and ...

The lines `(x-20/1=(y-3)/1=(z-4)/(-k_ and (x-10/k=(y-4)/2=(z-5)/1` are coplanar if (A) `k=3 or -3` (B) `k=0 or -1` (C) `k=1 or -1` (D) `k=0 or -3`

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