Check sibling questions

Ex 9.1, 9 - Chapter 9 Class 11 Sequences and Series (Term 1)

Last updated at Sept. 3, 2021 by

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

Solve all your doubts with Teachoo Black (new monthly pack available now!)

Join Teachoo Black

Transcript

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

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

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.