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If the chord of contact of the tangents drawn from a point on the circle `x^2+y^2=a^2` to the circle `x^2+y^2=b^2` touches the circle `x^2+y^2=c^2` , then prove that `a ,b` and `c` are in GP.

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The correct Answer is:
`=>` a, b, c are in GP.
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