Class XI Chapter 9 – Sequences and Series Maths ______________________________________________________________________________ 31 31 4 a 3 1 5 5 625 4 1 4 1 5 a 4 1 5 5 3125 a 5 1 1 5 5 15625 5 51 6 Therefore, the required terms are 25, 125,625, 3125 and 15625. Question 6: Write the first five terms of the sequences whose Solution 6: Substituting n 1,2,3,4,5 2 1 5 6 3 a1 1 4 4 2 a a a a 2 3 4 5 2 2 5 9 9 2 2. 4 4 2 2 3 5 14 21 3 3 4 4 2 2 4 5 4 21 4 2 5 5 30 75 5 5 4 4 2 , we obtain Therefore, the required terms are 3 , 9 , 21 ,21 and 2 2 2 th n 75 2 term is . a n 2 n 5 n 4 Question 7: Find the 17 th term in the following sequence whose Solution 7: Substituting n 17 , we obtain a17 4 17 3 68 3 65 Substituting n 24 , we obtain a24 4 24 3 96 3 93 a 4n 3; a , a th n term is n 17 24 Printed from Vedantu.com. Register now to book a Free LIVE Online trial session with a Top tutor.

Class XI Chapter 9 – Sequences and Series Maths ______________________________________________________________________________ Question 8: Find the 7 th term in the following sequence whose Solution 8: n Substituting 7 , we obtain 2 7 49 7 7 a 2 128 th n term is a n n 2 2 n ; a 7 Question 9: Find the 9 th term in the following sequence whose Solution 9: Substituting n 7 91 3 3 , we obtain a 9 1 9 9 729 th n term is n 1 3 a 1 n ; a n 9 Question 10: Find the 20 th term in the following sequence whose Solution 10: Substituting a 20 n 20, we obtain 20 20 2 20 18 360 20 3 23 23 th n term is a n n n 2 ; a n 3 20 Question **11**: Write the first five terms of the following sequence and obtain the corresponding series: 3, 3 2 for all n 1 a a a 1 n n 1 Solution **11**: a1 3, an 3an 1 2 2 1 for n 1 a 3a 2 3 3 2 **11** a 3a 2 3 **11** 2 35 3 2 Printed from Vedantu.com. Register now to book a Free LIVE Online trial session with a Top tutor.

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Class XI Chapter 4 - Principle of M

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Class XI Chapter 12 - Introduction

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Class XI Chapter 15 - Statistics Ma

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