Example 2 - Write {x : x is a positive integer and x2 < 40}

Example 2 - Chapter 1 Class 11 Sets - Part 2

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Example 2 Write the set {x : x is a positive integer and x2 < 40} in the roster form. Positive integer = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10…. 12 = 1 22 = 4 32 = 9 42 = 16 52 = 25 62 = 36 72 = 49 The required numbers are 1, 2, 3, 4, 5, 6. So, the given set in the roster form is {1, 2, 3, 4, 5, 6}.

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.