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9. Sequences and Series Mathematics class 11 in English Medium ncert book solutions Exercise 9.1 (Available)
9. Sequences and Series Exercise 9.1 (Available) – Complete NCERT Book Solutions for Class 11 Mathematics (English Medium). Get all chapter explanations, extra questions, solved examples and additional practice questions for 9. Sequences and Series Exercise 9.1 (Available) to help you master concepts and score higher.
9. Sequences and Series Mathematics class 11 in English Medium ncert book solutions Exercise 9.1 (Available)
NCERT Solutions for Class 11 Mathematics play an important role in helping students understand the concepts of the chapter 9. Sequences and Series clearly. This chapter includes the topic Exercise 9.1 (Available), which is essential from both academic and examination point of view. The solutions provided here are prepared strictly according to the latest NCERT syllabus and follow the guidelines of CBSE to ensure accuracy and relevance. Each question is explained in a simple and student-friendly manner so that learners can grasp the concepts without confusion. These NCERT Solutions are useful for regular study, homework help, and exam preparation. All textbook questions are solved step by step to improve problem-solving skills and conceptual clarity. Students of Class 11 studying Mathematics can use these solutions to revise important topics, understand difficult questions, and practise effectively before examinations. The chapter 9. Sequences and Series is explained in a structured way, making it easier for students to connect the theory with the topic Exercise 9.1 (Available). By studying these updated NCERT Solutions for Class 11 Mathematics, students can build a strong foundation, boost their confidence, and score better marks in school and board exams.
9. Sequences and Series
Exercise 9.1 (Available)
Exercise 9.1
Write the first five terms of each of the sequences in Exercises 1 to 6 whose nth terms are:
Q1. Write the first five terms of the sequences whose nth term is an = n(n+2).
Solution: Q1.
is an = n(n+2)
Putting n = 1, 2, 3, 4 and 5 we obtain
a1 = 1(1 + 2) = 1× 3 = 3
a2 = 2(2 + 2) = 2× 4 = 8
a3 = 3(3 + 2) = 3× 5 = 15
a4 = 4(4 + 2) = 4× 6 = 24
a5 = 5(5 + 2) = 5× 7 = 35
Therefore, the five terms are 3, 8, 15, 24 and 35
Q5. Write the first five terms of the sequences whose nth term is an = (-1)n-15n+1
Solution: Q5.
an = (-1)n-15n+1
Putting n = 1, 2, 3, 4 and 5 we obtain
a1 = (-1)1-151+1 = (1)(5)2 = 25
a2 = (-1)2-152+1 = (-1) (5)3 = - 125
a3 = (-1)3-153+1 = (1) (5)4 = 625
a4 = (-1)4-154+1 = (-1) (5)5 = - 3125
a5 = (-1)5-155+1 = (1) (5)6 =156 25
Thus the five terms are 25, -125, 625, - 3125 and 15625
See other sub-topics of this chapter:
1. Exercise 9.1 (Available) 2. Exercise 9.2 3. Exercise 9.3 (Available) 4. Exercise 9.4 5. Miscellaneous Exercise on Chapter - 9 (Available)