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Ex 9.1, 4 - Write first five terms an = 2n - 3/6 - Chapter 9 - Finding Sequences

Ex 9.1,4 - Chapter 9 Class 11 Sequences and Series - Part 2
Ex 9.1,4 - Chapter 9 Class 11 Sequences and Series - Part 3

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Transcript

Ex9.1 , 4 Write the first five terms of the sequences whose nth term is an =" " (2n−3)/6 We need to find first five terms i.e. a1, a2, a3 , a4, a5 an =" " (2n−3)/6 Putting n = 1 in (1) a1 =" " (2 × 1 − 3)/6 = (2 − 3)/6 = (−1)/6 Putting n = 2 in (1) a2 =" " (2 × 2 − 3)/6 = (4 − 3)/6 = 1/6 Putting n = 3 in (1) a3 =" " (2 × 3 − 3)/6 = (6 − 3)/6 = 3/6 = 1/2 Putting n = 4 in (1) a4 =" " (2 × 4 − 3)/6 = (8 − 3)/6 = 5/6 Putting n = 5 in (1) a5 =" " (2 × 5 − 3)/6 = (10 − 3)/6 = 7/6 Hence first five terms are (−1)/6, 1/6, 1/2, (5 )/6, and 7/( 6)

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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.