If the distances from origin of the centres of 3 circles x²+y²+2alpha_ix= a² (i=1,2,3) are in G.P. , then length of the tangents drawn to them frm any point on the circles x2+y2 = a2 are in :

(a) A.P (b) G.P (c) H.P (d) None of these

ans. is (b) ...plzz explain..

Dear Ranjita,

The length of the tangents are in GP.

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will u plzz explain..