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Q)

If a,b and c are in A.P thin the straight line $ax+by+c=0$ will always pass through line $ax+by+c=0$ will always pass through a fixed point whose coordinates are

$\begin{array}{1 1}(A)\;(1,2) \\(B)\;(1,-2)\\(C)\;(1,1)\\(D)\;(1,3)\end{array}$

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A)
Need homework help? Click here.
If a,b,c are in A.P then
$a+c=2b$
=> $a-2b+c=0$
=> $ax+by+c=0$
it passes through $(1,-2)$
Hence B is the correct answer.
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