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Ex 9.1, 9 - Find 9th term an = (-1)n-1 n3 - Chapter 9 - Ex 9.1

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Ex9.1 , 9 Find the 9th term in the following sequence whose nth term is an =" (−1)n−1 n3" We need to find a9 an =" (−1)n−1 n3" putting n = 9 in (1) a9 =" (−1)9−1 (9)3 " = (-1)8 "(9)3" = 1 × 93 = "(9)3" = 729 Hence the 9th term is 729

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.