Ex 3.5, 1 Which of the following statements are true? (d) If a number is divisible by 9 and 10 both, then it must be divisible by 90.We know that If a number is divisible by two co-prime numbers, it is divisible their product Checking whether 9 & 10 are co-prime Factors of 9 are 1, 3, 9 Factors of 10 are 1, 2, 5, 10 Since common factor is 1 ∴ 9 & 10 are co-prime So, if a number divisible by 9 and 10 both, then it must be divisible by it product 90 as well ∴ True.

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Davneet Singh

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.

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