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When two soap bubbles of radii a and b (...

When two soap bubbles of radii a and b `( b gt a )` coalesce, the radius of curvature of common surface is `:`

A

`(a+b)/( ab)`

B

`(ab)/( a+b)`

C

`(b-a)/( ab)`

D

`(ab)/(b-a)`

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