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Question 1
If two circles $x^{2}+y^{2}+2gx+2fy=0$ and $x^{2}+y^{2}+2g'x+2f'y=0$ touch each other then whichof the following is true?
A.
$gf=g'f'$
B.
$g'f=gf'$
C.
$gg'=ff'$
D.
None of these
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