if non-zero numbers a,b,c are in HP then the st. line x/a + y/b + 1/c=0 always passes trough the fixed point:-
1) (-1,-2)
2) (-1,2)
3) (1,-1/2)
4) (1,-2)

since a, b and c are in HP therefore
1a+1c=2b1a-2b+1c=0therefore the line xa+yb+1c=0passes through the point (1, -2)thus option (4) is correct

hope this helps you

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