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Three circles of radii a, b, c (a < b < c) touch each other externally. If they have x-axis as a common tangent, then :

1. b 1 = a 1 + c 1
2. a, b, c are in A.P.
3. a , b , c are in A.P.
4. a 1 = b 1 + c 1

Correct answer: a 1 = b 1 + c 1

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