Sequences & Series - Most Important Questions (Part 1) | Class 11 Maths Chapter 9 | CBSE /IIT/JEE
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✅ In this video,
✔️ Class: 11th
✔️ Subject: Maths
✔️ Chapter: Sequences & Series (Chapter 9)
✔️ Topic Name: Sequences & Series - Most Important Questions (Part 1)
✔️ Topics Covered In This Video (By Shivani Mam): This video will provide a detailed explanation of Sequences & Series, one of the most important topics to ace your mathematics exams. The video will focus on the most important questions related to this topic and provide solutions with detailed explanations. It will be presented by experienced mathematics teacher Shivani Mam, who will provide tips and tricks to help students learn the concepts quickly and easily.
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00:00 Introduction: Sequences & Series - Most Important Questions (Part 1)
01:09 Question 1 to 5
1. Find the first four terms of the sequence whose first term
is 1 and whose (n+ 1)th term is obtained by subtracting n from
its nth term.
2. The first term of a G.P. is 1. The sum of the third and fifth
terms is 90. Find the common ratio of the G.P.
3. If the pth, qth and rth terms of a G.P. are a, b, c
respectively, prove that: a .bP).cP )=1.
4. The number of bacteria in a certain culture doubles
every hour. If there were 30 bacteria present in the culture
originally, how many bacteria will be present at the end of 2nd
hour, 4th hour and nth hour?
38:09 Question 6 to 10
1. The sum of three numbers in G.P. is 56. If we subtract 1, 7,
21 from these numbers in that order, we obtain an arithmetic
progression. Find the numbers.
2. Find the sum of the series 2+ 6+ 18 4374.
3. Find the sum of the following series:
(i) 5 55 555 to n terms
(ii) O.7+ 0.77 0.777. to n terms
4. Find a G.P. for which the summ of the first two terms is -4
and the fifth term is 4 times the third term.
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