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

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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The correct Answer is:

A

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