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Sequences and Series

CBSE · Class 11 · Mathematics

Quick revision notes for Sequences and Series — CBSE Class 11 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

126 questions60 flashcards5 concepts

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Key Topics to Revise

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1. Sequences and Their Terms

  • A sequence is an arrangement of numbers in a definite order according to some rule.
  • The terms of a sequence are written as a1, a2, a3, ..., an, where the subscript shows the position.
  • The nth term is also called the general term of the sequence.
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2. Series and Sigma Notation

  • A series is the expression formed by adding the terms of a sequence.
  • Sigma notation is a compact way to write a series.
  • The expression a1 + a2 + a3 + ... + an is written as sum from k=1 to n of ak.
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3. Geometric Progression and General Term

  • A geometric progression is a sequence in which each term is non-zero and the ratio of a term to the previous term is constant.
  • This constant ratio is called the common ratio and is denoted by r.
  • If the first term is a, then the G.P. is written as a, ar, ar^2, ar^3, ...
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4. Sum of n Terms of a G.P.

  • The sum of the first n terms of a G.P. is written as S_n.
  • There are two separate cases for the sum formula.
  • If r = 1, then all terms are equal and S_n = na.

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Full Notes

Key Concepts

A sequence is an arrangementThe nth term of a sequenceA finite sequence has a fixedA series is the expression a1A sequence a1

Frequently Asked Questions

What are the important topics in Sequences and Series for CBSE Class 11 Mathematics?
Sequences and Series covers several key topics that are frequently asked in CBSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Sequences and Series — CBSE Class 11 Mathematics?
Understand the core concepts first, then work through the 126 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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