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If the equation hxy + gx + fy + c = 0 re...

If the equation `hxy + gx + fy + c = 0` represents a pair of straight lines, then

A

(a) `fh=cg`

B

(b) `fg=ch`

C

(c) `h^(2)=gf`

D

(d) `fgh=c`

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The correct Answer is:
B
NA
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