NCERT solution Class 11 sequences and series

NCERT Solutions

Class 11 Maths

Sequences and Series

NCERT Questions

Ex.9.1 Q.1
Ex.9.1 Q.2
Ex.9.1 Q.3
Ex.9.1 Q.4
Ex.9.1 Q.5
Ex.9.1 Q.6
Ex.9.1 Q.7
Ex.9.1 Q.8
Ex.9.1 Q.9
Ex.9.1 Q.10
Ex.9.1 Q.11
Ex.9.1 Q.12
Ex.9.1 Q.13
Ex.9.1 Q.14
Ex.9.2 Q.1
Ex.9.2 Q.2
Ex.9.2 Q.3
Ex.9.2 Q.4
Ex.9.2 Q.5
Ex.9.2 Q.6
Ex.9.2 Q.7
Ex.9.2 Q.8
Ex.9.2 Q.9
Ex.9.2 Q.10
Ex.9.2 Q.11
Ex.9.2 Q.12
Ex.9.2 Q.13
Ex.9.2 Q.14
Ex.9.2 Q.15
Ex.9.2 Q.16
Ex.9.2 Q.17
Ex.9.2 Q.18
Ex.9.3 Q.1
Ex.9.3 Q.2
Ex.9.3 Q.3
Ex.9.3 Q.4
Ex.9.3 Q.6
Ex.9.3 Q.6
Ex.9.3 Q.7
Ex.9.3 Q.8
Ex.9.3 Q.9
Ex.9.3 Q.10
Ex.9.3 Q.11
Ex.9.3 Q.12
Ex.9.3 Q.13
Ex.9.3 Q.14
Ex.9.3 Q.15
Ex.9.3 Q.16
Ex.9.3 Q.17
Ex.9.3 Q.18
Ex.9.3 Q.19
Ex.9.3 Q.20
Ex.9.3 Q.21
Ex.9.3 Q.22
Ex.9.3 Q.23
Ex.9.3 Q.24
Ex.9.3 Q.25
Ex.9.3 Q.26
Ex.9.3 Q.27
Ex.9.3 Q.28
Ex.9.3 Q.29
Ex.9.3 Q.30
Ex.9.3 Q.31
Ex.9.3 Q.32
Ex.9.4 Q.1
Ex.9.4 Q.2
Ex.9.4 Q.3
Ex.9.4 Q.4
Ex.9.4 Q.5
Ex.9.4 Q.6
Ex.9.4 Q.7
Ex.9.4 Q.8
Ex.9.4 Q.9
Ex.9.4 Q.10
Ex.Misc.Q.1
Ex.Misc.Q.2
Ex.Misc.Q.3
Ex.Misc.Q.4
Ex.Misc.Q.5
Ex.Misc.Q.6
Ex.Misc.Q.7
Ex.Misc.Q.8
Ex.Misc.Q.9
Ex.Misc.Q.10
Ex.Misc.Q.11
Ex.Misc.Q.12
Ex.Misc.Q.13
Ex.Misc.Q.14
Ex.Misc.Q.15
Ex.Misc.Q.16
Ex.Misc.Q.17
Ex.Misc.Q.18
Ex.Misc.Q.19
Ex.Misc.Q.20
Ex.Misc.Q.21
Ex.Misc.Q.22
Ex.Misc.Q.23
Ex.Misc.Q.24
Ex.Misc.Q.25
Ex.Misc.Q.26
Ex.Misc.Q.27
Ex.Misc.Q.28
Ex.Misc.Q.29
Ex.Misc.Q.30
Ex.Misc.Q.31
Ex.Misc.Q.32
Ex.15.2 Q.6
Ex.15.2 Q.7
Ex.15.2 Q.8
Ex.15.2 Q.9
Ex.15.2 Q.10
Ex.15.3 Q.1
Ex.15.3 Q.2
Ex.15.3 Q.3
Ex.15.3 Q.4
Ex.15.3 Q.5
Ex.Misc.Q.1
Ex.Misc.Q.2
Ex.Misc.Q.3
Ex.Misc.Q.4
Ex.Misc.Q.5
Ex.Misc.Q.6
Ex.Misc.Q.7

Ex.Misc.Q.18

If a and b are the roots of x² – 3x + p = 0 and c, d are roots of x² – 12x + q = 0,

where a, b, c, d, form a G.P. Prove that (q + p): (q – p) = 17: 15.

It is given that a and b are the roots of x² – 3x + p = 0

So, a + b = 3 and ab = p ………………………………… (1)

Also, c and d are the roots of x² – 12x + q = 0 So, c + d = 12 and cd = q … (2)

It is given that a, b, c, d is in G.P.

Let a = x, b = xr, c = xr², d = xr³

From (1) and (2), we get

x + xr = 3

x (1 + r) = 3

xr² + xr³ =12

xr²(1 + r) = 12

On dividing, we obtain

xr²(1 + r) ÷ x (1 + r) = 12 ÷ 3

r² = 4

r = ±2

When r = 2, x = 3 ÷ (1 + 2) = 3 ÷ 3 = 1

When r = -2, x = 3 ÷ (1 - 2) = 3 ÷ (-1) = -3

Case 1:

When r = 2 and x =1, ab = x²r = 2, cd = x²r⁵ = 32

So, (q + p) ÷ (q – p) = (32 + 2) ÷ (32 – 2) = 34 ÷ 30 = 17 ÷ 15

Hence, (q + p): (q – p) = 17: 15

Case 2:

When r = -2 and x = -3, ab = x²r = -18, cd = x²r⁵ = -288

So, (q + p) ÷ (q – p) = (-288 - 18) ÷ (-288 + 18) = -306 ÷ (-270) = 17 ÷ 15

Hence, (q + p): (q – p) = 17: 15

Thus, in both the cases, we obtain (q + p): (q – p) = 17: 15

Video solution:

Sequences and Series Class 11 Maths NCERT Chapter 8 NCERT Solutions

Solving NCERT textbook questions of Sequences and Series Class 11 Maths NCERT Chapter 8 is a crucial step to gauge your understanding of the concepts. It provides you with an opportunity to assess your grasp of the material after learning each chapter. We have already provided solutions to all the exercises in the NCERT textbook of Class 11 Maths Sequences and Series, available in various formats such as video, text, and downloadable PDFs. If you need assistance with any of the NCERT questions or any other academic topics, feel free to ask in the “Ask Questions” section of LearnoHub.com.

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Using the NCERT solutions module effectively can significantly enhance your learning experience and understanding of the subject matter. Here's a step-by-step guide on how to make the most out of the NCERT solutions:

Attempt to Solve Yourself: Before looking at the solution, try to solve or answer the question independently. This practice will help you test your knowledge and problem-solving skills.
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Solve Again Yourself: Once you've understood the solution, attempt to solve the question again by yourself. Repetition and practice solidify your understanding of the concepts and improve retention.
Avoid Memorization: Focus on understanding the underlying principles and concepts behind each solution. Avoid simply memorizing the solutions, as this may hinder your ability to apply the knowledge in different contexts.
Attempt All Questions: Make an effort to attempt all the questions provided in the NCERT textbook. This comprehensive practice will help you cover the entire syllabus and reinforce your understanding across various topics. You may refer Class 11 Maths Sequences and Series Online Test on LearnoHub.com.
Review and Revise: Regularly review the concepts and solutions you've learned. Revise your notes and practice regularly to retain the knowledge effectively. You may refer Sequences and Series Class 11 Maths Notes.
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NCERT solutions of Sequences and Series Class 11 Maths - all questions of all exercises are solved. Q. No. 1, 2, 3, and so on. Complete explanation and detailed solution makes them the best videos for Class 11 Maths Sequences and Series NCERT solutions.