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If the chord of contact of the tangents drawn from a point on the circle `x^2+y^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.

A

A.P.

B

G.P.

C

H.P.

D

none of these

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The correct Answer is:
B
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