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Three circular rings of equal radii of 1 cm each are touching each other . A string runs all around the set of rings very tightly . What is the minimum length of string required to bind all the three rings in the given manner ?

A

`6/pi cm`

B

`2(3+pi) cm`

C

`pi/6 cm`

D

can't be determined

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The correct Answer is:
B
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