Question 6 - Past Year MCQ (Maths Standard) - Chapter 1 Class 10 Real Numbers

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Question 6 If n is a natural number, then 2(5n + 6n) always ends with (a) 1 (b) 4 (c) 3 (d) 2Now, 5n always ends with 5 6n always ends with 6 Thus, (5n + 6n) always ends with 5 + 6 = 11 Thus, 2 × (5n + 6n) always ends with 2 × 11 = 22 i.e. it always ends with 2 So, the correct answer is (d)

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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 14 years. He provides courses for Maths, Science and Computer Science at Teachoo