Question 1 - Number of elements in set - 2 sets (Direct) - Chapter 1 Class 11 Sets

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Question 1 If X and Y are two sets such that n(X) = 17, n(Y) = 23 and n (X ∪ Y) = 38, find n(X ∩ Y). n(X) = 17, n(Y) = 23, n(X ∪ Y) = 38 n(X ∩ Y) = ? We know that n(X ∪ Y) = n(X)+ n(Y) – n(X ∩ Y) 38 = 17 + 23 – n(X ∩ Y) 38 = 40 – n(X ∩ Y) n(X ∩ Y) = 40 – 38 n(X ∩ Y) = 2

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo