Diagrammatic Approach - It is quite clear from the diagram that the number of people at the party were 60 + 20 + 40 = 120 Mathematical approach : Let n(A) be the no. of persons that prefers android phones , the no of persons that prefers IOS be n(B) and n(A∩B) be the persons who liked both may prefer both. Thus using the formula n(AUB) = n(A) + n(B) – n(A∩B) n(AUB) = 80 + 60 – 20 = 120 Correct Answer: 120
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