Main post link -> http://olympiads.hbcse.tifr.res.in/uploads/rmo-2012/crmosol-12-3.pdf

Please check the question number four and tell me whether your answer is matching with the given one. They say that the disjoint sum of the three set gives the required set but i can't agree to that,what if A contained 1.2.5.7.8 and B contained 1,3,5,7,8 then the disjoint subjets' addition doesn't include 1.

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