If the lines ax+ky+10=0, bx+(k+1)y+10=0 and cx+(k+2)y+10=0 are concurrent, then

JEE Main Mathematics question

If the lines , and are concurrent, then

Answer: (C)

Concurrency requires . Subtracting row 1 from row 2 and row 2 from row 3 gives

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Question ID VK-024336