MathematicsMedium127×since 2002Q3068Three circles of radii a, b, c (a < b < c) touch each other externally. If they have x-axis as a common tangent, then :Aa, b, c are in A.P.Ba,b,c\sqrt a ,\sqrt b ,\sqrt ca,b,c are in A.PC1b+1c{1 \over {\sqrt b }} + {1 \over {\sqrt c }}b1+c1 = 1a{1 \over {\sqrt a }}a1D1b=1a+1c{1 \over {\sqrt b }} = {1 \over {\sqrt a }} + {1 \over {\sqrt c }}b1=a1+c1Check answerSkip