Ex 1.1, 3 - Chapter 1 Class 11 Sets - Part 4

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Ex 1.1, 3 Write the following sets in roster form: (iv) D = {x: x is a prime number which is divisor of 60} Hence, the elements of the set are 2, 3, 5 Hence D = {2, 3, 5} Prime Number Those number which are divisible by 1 and number itself. Eg: 3 is a prime number, 3/1 = 3 , 3/3 = 1 Prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 21, 23… Divisor of 60 60 = 1 × 60 60 = 2 × 30 60 = 3 × 20 60 = 4 × 15 60 = 5 × 12 60 = 6 × 10 So, divisors of 60 are 1, 2, 3, 4, 5, 6, 60, 30, 20, 15, 12, 10

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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