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If two circles x^2 + y^2 + ax + by = 0 a...

If two circles `x^2 + y^2 + ax + by = 0 and x^2 + y^2 + kx + ly = 0` touch each other, then (A) `al = bk` (B) `ak = bl` (C) `ab = kl` (D) none of these

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