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Last updated at Sept. 9, 2021 by Teachoo

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Ex 3.4, 5 Which of the following numbers are co-prime? (c) 30 and 415 Factors of 30 1 × 30 = 30 2 × 15 = 30 3 × 10 = 30 5 × 6 = 30 6 × 5 = 30 We stop as 6 & 5 have occurred earlier So factors of 30 are 1, 2, 3, 5, 6, 10, 15, 30 Factors of 415 1 × 415 = 415 5 × 83 = 415 83 × 5 = 415 We stop here as 83 and 5 have occurred earlier So factors of 415 are 1, 5, 83, 415 So, common factors are 1, 5 Since common factors are other than 1, They are not co-prime numbers

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.