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The lines x+y-1=0,(m-1)x+(m^2-7)y-5=0, a...

The lines `x+y-1=0,(m-1)x+(m^2-7)y-5=0,` and `(m-2)x+(2m-5)y=0` are concurrent for three values of `m` concurrent for one value of `m` concurrent for no value of `m` parallel for `m=3.`

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