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There are six circular rings of iron , k...

There are six circular rings of iron , kept close to each other . A string binds them as tightly as possible. If the radius of each circular iron ring is 1 cm. What is the minimum possible length of string required to bind them ?

A

`2(6+3sqrt3+pi) cm`

B

`6(2+sqrt3) pi cm`

C

`2(6+pi) cm`

D

none of these

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The correct Answer is:
C
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