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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 (a)concurrent for three values of `m` (b)concurrent for no value of `m` (c)parallel for one value of `m` (d)parallel for two values of `m`

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