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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) a,bc,are in AP(b) a,b,c are in GP (c) `a^2,b^2,c^2` are in AP (d) `a^2,b^2,c^2` are in GP

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