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If the squares of the lengths of the tan...

If the squares of the lengths of the tangents from a point P to the circles `x^2+y^2=a^2`, `x^2+y^2=b^2` and `x^2+y^2=c^2` are in A.P. then `a^2,b^2,c^2` are in

A

a, b, c are in GP

B

a,b,c are in AP

C

`a^2, b^2, c^2` are in AP

D

`a^2,b^2,c^2` are in GP

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