If non zero numbers $a, b, c$ are in $H.P.,$ then the straight line ${x \over a} + {y \over b} + {1 \over c} = 0$ always passes through a fixed point. That point is :
$(-1,2)$
$(-1, -2)$
$(1, -2)$
$\left( {1, - {1 \over 2}} \right)$
Solution
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