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Question18 Prove the following by using the principle of mathematical induction for all n N: 1 + 2 + 3 + ..+ n < 1/8 (2n+1)2 Let P (n) : 1 + 2 + 3 + ..+ n < 1/8 (2n+1)2 For n = 1 L.H.S = 1 R.H.S = 1/8 (2.1 + 1)2 = 1/8 ( 2 + 1)2 = 1/8 (3)2 = 9/8 Since 1 < 9/8 Thus L.H.S < R.H.S P(n) is true for n = 1 Assume P(k) is true 1 + 2 + 3 + ..+ k < 1/8 (2k+1)2 We will prove that P(k + 1) is true. L.H.S = 1 + 2 + 3 + . + (k + 1) R.H.S = 1/8 (2(k + 1) + 1)2

  1. Mathematical Induction
  2. Serial order wise

About the Author

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