Last updated at May 29, 2018 by Teachoo

Transcript

Ex 4.1, 9:Prove the following by using the principle of mathematical induction for all n โ N: 1/2 + 1/4 + 1/8 + ....+ 1/2๐ = 1 โ 1/2๐ Let P(n): 1/2 + 1/4 + 1/8 + ....+ 1/2๐ = 1 โ 1/2๐ For n = 1, we have L.H.S = 1/2 R.H.S = 1 โ 1/21 = 1/2 Hence, L.H.S. = R.H.S , โด P(n) is true for n = 1 Assume P(k) is true 1/2 + 1/4 + 1/8 + ....+ 1/2๐ = 1 โ 1/2๐ We will prove that P(k + 1) is true. R.H.S = 1 โ 1/2^(๐ + 1) L.H.S = 1/2 + 1/4 + 1/8 + ....+ 1/2^(๐ + 1) L.H.S = R.H.S โด P(k + 1) is true whenever P(k) is true. โด By the principle of mathematical induction, P(n) is true for n, where n is a natural number

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About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.