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

  1. Chapter 9 Class 11 Sequences and Series
  2. Serial order wise
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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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