If the three distinct lines x + 2ay + a = 0, x + 3by + b = 0 and x + 4ay + a = 0 are concurrent, then the point (a, b) lies on a :

JEE Main 2014 Mathematics question

If the three distinct lines , and are concurrent, then the point (a, b) lies on a :

Answer: (3)

Subtracting the first line from the third gives . The lines are distinct, so (otherwise the first and third coincide), forcing y = 0 at the common

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Question ID VK-104593