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A dinner party is to be arranged for a group of 100 persons. In this party, 50 persons prefer fish, 60 prefer chicken and 10 do not prefer either chicken or fish. Find the number of persons who prefer both fish and chicken.

 
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Heyy According to the formula AUB=n(A) n(B)-n(AnB) that gives 90=50-x 60-x-x => 110-3x=90 x=20/3 isn't this correct tell me soon