NCERT Exemplar for Class 11, Maths Chapter 9

NCERT Exemplar Class 11 Maths Chapter 9: Sequence and Series. NCERT Exemplar Solutions for Class 11 Maths Chapter 9 Sequence and Series prepare students for their Class 11 exams thoroughly.

Maths problems and solutions for the Class 11 pdf are provided here which are similar to the questions being asked in the previous year’s board.

Contents

1 NCERT Exemplar Class 11 Maths Chapter 9: Sequence and Series
2 Answers to Objective Type Questions

NCERT Exemplar Class 11 Maths Chapter 9: Sequence and Series

Class 11: Maths Chapter 9 solutions. Complete Class 11 Maths Chapter 9 Notes.

Maths Important Questions Class 11 are given below.
9.1 Overview
By a sequence, we mean an arrangement of numbers in a definite order according to some rule. We denote the terms of a sequence by a1 , a2 , a3 , … , etc., the subscript denotes the position of the term. In view of the above a sequence in the set X can be regarded as a mapping or a function f : N → X defined by

Domain of f is a set of natural numbers or some subset of it denoting the position of term. If its range denoting the value of terms is a subset of R real numbers then it is called a real sequence.
A sequence is either finite or infinite depending upon the number of terms in a sequence.
We should not expect that its terms will be necessarily given by a specific formula.
However, we expect a theoretical scheme or rule for generating the terms.
Let a 1 , a 2 , a 3 , … , be the sequence, then, the expression a 1 + a 2 + a 3 + … is called the
series associated with given sequence. The series is finite or infinite according as the
given sequence is finite or infinite.
Remark When the series is used, it refers to the indicated sum not to the sum itself.
Sequence following certain patterns are more often called progressions. In
progressions, we note that each term except the first progresses in a definite manner.

9.1.1 Arithmetic progression (A.P.) is a sequence in which each term except the
first is obtained by adding a fixed number (positive or negative) to the preceding term.