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Ex 8.1,1 - Chapter 8 Class 11 Sequences and Series
Last updated at August 17, 2026 by Teachoo
Chapter 8 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
Ex9.1,1 Write the first five terms of the sequences whose nth term is an = n(n+2) We need to find first five terms i.e. a1, a2, a3 , a4, a5 an = n(n + 2) Putting n = 1 in an a1 = 1(1 + 2) = 1 × 3 = 3 Putting n = 2 in an a2 = 2(2 + 2) = 2 × 4 = 8 Putting n = 3 in an a3 = 3(3 + 2) = 3 × 5 = 15 Putting n = 4 in an a4 = 4(4 + 2) = 4 × 6 = 24 Putting n = 5 in an a5 = 5(5 + 2) = 5 × 7 = 35 Hence first five terms are 3, 8, 15, 24, and 35.
