Ex 3.4, 5 - Which numbers are co-prime? (a) 18 and 35 (b) 15 and 37

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Ex 3.4, 5 Which of the following numbers are co-prime? (a) 18 and 35 If two Numbers have common factor 1, They are Co-prime Numbers Factors of 18 1 × 18 = 18 2 × 9 = 18 3 × 6 = 18 6 × 3 = 18 We stop here as 3 & 6 have occurred earlier So factors of 18 are 1, 2, 3, 6, 9, and 18 Factors of 35 1 × 35 = 35 5 × 7 = 35 7 × 5 = 35 We stop here as 7 and 5 have occurred earlier So factors of 35 are 1, 5, 7, 35 Since common factor is 1, They are co-prime numbers

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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.