Three circles of radii \( a, b, c(abc) \) touch each P other extern...

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Three circles of radii \( a, b, c(abc) \) touch each
P other externally. If they have \( \mathrm{x} \)-axis as a common

W tangent, then
(1) \( a, b, c \) are in A.P.
(2) \( \frac{1}{\sqrt{a}}=\frac{1}{\sqrt{b}}+\frac{1}{\sqrt{c}} \)
(3) \( \sqrt{a}, \sqrt{b}, \sqrt{c} \) are in A.P.
(4) \( \frac{1}{\sqrt{b}}=\frac{1}{\sqrt{a}}+\frac{1}{\sqrt{c}} \)
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