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# NCERT Solutions Class 11 Maths Chapter 9 Exercise 9.1 Sequences and Series

NCERT solutions for class 11 maths chapter 9 exercise 9.1 Sequences and Series defines finite and infinite sequences. A sequence that has a finite number of terms is finite, whereas a sequence with infinite terms is an infinite sequence. Quite a lot of times, it is possible to write a sequence in terms of an algebraic formula, such as in the case of the sequence for odd natural numbers 1, 3, 5......, the nth term here would be a_{n} = 2n - 1, n being the natural number. The NCERT solutions class 11 maths chapter 9 exercise 9.1 consists of 14 short questions, which require the students to find out the nth term for the given sequences.

The students will notice that for the sequence of prime numbers 2, 3 ,5 ,7, there is no formula for the nth prime number. Hence, the students must remember that a sequence is a function that has a domain consisting of a set of natural numbers or its subset. And for this, the functional notation a(n) is also used instead of a_{n}. In sequences where there are no visible patterns, the sequence can be generated by a recurrence relation that is a_{n} = a_{n-2} + a_{n-1}, n>2, also known as the Fibonacci sequence. The class 11 maths NCERT solutions chapter 9 exercise 9.1 Sequences and Series is presented below in a scrollable PDF format. :

**☛** Download NCERT Solutions Class 11 Maths Chapter 9 Exercise 9.1

**Exercise 9.1 Class 11 Chapter 9 **

### More Exercises in Class 11 Maths Chapter 9

- NCERT Solutions Class 11 Maths Chapter 9 Ex 9.2
- NCERT Solutions Class 11 Maths Chapter 9 Ex 9.3
- NCERT Solutions Class 11 Maths Chapter 9 Ex 9.4
- NCERT Solutions Class 11 Maths Chapter 9 Miscellaneous Exercise

## NCERT Solutions Class 11 Maths Chapter 9 Exercise 9.1 Tips

The NCERT solutions class 11 maths chapter 9 exercise 9.1 Sequences and Series has well-drafted easy examples on finding the nth term in given sequences which the students are advised to practice. They must also remember that when “sum of a series,” phrase is used anywhere it means that the number will be obtained from the addition of terms.

The NCERT solutions class 11 maths chapter 9 exercise 1.1 also explains that if a_{1} , a_{2} , a_{3} ,…,a_{n} , is any given sequence. Then, the expression a_{1 }+ a_{2} + a_{3} +,...…+ a_{n} + ...... is called the series of that sequence. It can be finite or infinite and series are usually represented in the Greek letter ∑ called the ‘Sigma’ notation. The students are advised to take note of such symbols so as to avoid confusion while solving the questions.

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