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If the straight lines a x + m ay + 1 =...

If the straight lines
`a x + m ay + 1 =0`
`b x + ( m +1) by + 1 =0`
`cx + (m+2) cy +1 =0, m ne0`
are concurrent, then a, b, c are in :

A

AP only for m = I

B

AP for all m

C

GP for all m

D

HP for all m

Text Solution

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The correct Answer is:
D
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