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P is a point on the line y+2x=1, and Qa ...

`P` is a point on the line `y+2x=1,` and `Qa n dR` two points on the line `3y+6x=6` such that triangle `P Q R` is an equilateral triangle. The length of the side of the triangle is `2/(sqrt(5))` (b) `3/(sqrt(5))` (c) `4/(sqrt(5))` (d) none of these

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