For all real values of a and b lines (2a...

For all real values of a and b lines `(2a + b)x +(a +3b)y + (b-3a) =0 `and `mx+ 2y +6 =0 `are concurrent, then m is equal to (A) -2 (B) -3(C)-4 (D) -5

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For all real values of a and b lines (2a + b) x + (a + 3b) y + (b - 3a) =0 and mx + 2y + 6=0 are concurent, then m is equal to

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