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The two circles `x^2+""y^2=""a x` and `x^2+""y^2=""c^2(c"">""0)` touch each other if : (1) `2|a|""=""c` (2) `|a|""=""c` (3) `a""=""2c` (4) `|a|""=""2c

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The two circles `x^2+""y^2=""a x` and `x^2+""y^2=""c^2(c"">""0)` touch each other if : (1) `2|a|""=""c` (2) `|a|""=""c` (3) `a""=""2c` (4) `|a|""=""2c`
A. |a|=c
B. a=2c
C. |a|=2c
D. 2|a|=c
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Correct Answer - A
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