This question is similar to Chapter 1 Class 10 Real Numbers - Ex 1.1

Please check the question here

https://www.teachoo.com/1469/488/Ex-1.2--6---Explain-why-7-x-11-x-13---13-and-7-x-6-x-5/category/Ex-1.2/

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Question 21 (A) Show that the number 2 × 5 × 7 × 11 + 11 × 13 is a composite number.Now, 2 × 5 × 7 × 11 + 11 × 13 = 11 × (2 × 5 × 7 + 13) = 11 × (70 + 13) = 11 × 83 Since it has more than two factors (11, 83, 1), ∴ It is a composite number

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 15 years. He provides courses for Maths, Science and Computer Science at Teachoo