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Ex 9.1, 10 - Chapter 9 Class 11 Sequences and Series (Term 1)
Last updated at Sept. 24, 2018 by Teachoo
Chapter 9 Class 11 Sequences and Series
Concept wise
-
Finding Sequences
- Arithmetic Progression (AP): Formulae based
- Arithmetic Progression (AP): Statement
- Arithmetic Progression (AP): Calculation based/Proofs
- Inserting AP between two numbers
- Arithmetic Mean (AM)
- Geometric Progression(GP): Formulae based
- Geometric Progression(GP): Statement
- Geometric Progression(GP): Calculation based/Proofs
- Inserting GP between two numbers
- Geometric Mean (GM)
- AM and GM (Arithmetic Mean And Geometric mean)
- AP and GP mix questions
- Finding sum from series
- Finding sum from nth number
Transcript
Ex9.1 , 10 Find the 20th term in the following sequence whose nth term is an =" " (n(n−2))/(n+3) ; We need to find a20 an =" " (n(n−2))/(n+3) Putting n = 20 a20 = (20(20−2))/(20+3) = (20(18))/23 = 360/23 Hence the 20th term is 360/23
