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Intersecting circles

How many separate compartments are formed within these six intersecting circles?

Not A or B.

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vinodsays...

equation of maximum number of compartments n number of circles can form = n(n-1)+1

n=6

hence number of compartments= 6(6-1)+1 = 31

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Chrissays...

great formula, thanks!

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x-boxsays...

There are 31 separate compartments formed

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