Class XI Chapter 9 – Sequences and Series Maths ______________________________________________________________________________ Exercise 9.1 Book Name: **NCERT** Solutions Question 1: Write the first five terms of the sequences whose Solution 1: an n n 2 Substituting a1 1 1 2 3 a2 2 2 2 8 a3 3 3 2 15 n 1,2,3,4 a4 4 4 2 24 a5 5 5 2 35 and 5, we obtain th n Therefore, the required terms are 3, 8, 15, 24 and 35. term is a nn 2 n . Question 2: Write the first five terms of the sequences whose Solution 2: a n n n 1 Substituting n 1,2,3,4,5 , we obtain th n term is a n n n 1 a 1 1 2 2 3 3 4 4 5 5 1 , 2 , 3 , 4 , 5 1 1 2 a 2 1 3 a 3 1 4 a 4 1 5 a 5 1 6 Therefore, the required terms are 1 , 2 , 3 , 4 2 3 4 5 and 5 6 Question 3: Write the first five terms of the sequences whose Solution 3: an 2 n th n term is an 2 n 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 ______________________________________________________________________________ Substituting a 1 1 2 2 a 2 2 2 4 a 3 3 2 8 a 4 4 2 16 a 5 5 2 32 n 1,2,3,4,5 , we obtain Therefore, the required terms are 2, 4, 8, 16 and 32. Question 4: Write the first five terms of the sequences whose Solution 4: Substituting 21 3 1 a1 6 6 a a a a 2 3 4 5 22 3 1 6 6 n 1,2,3,4,5 23 3 3 1 6 6 2 24 3 5 6 6 25 3 7 6 6 , we obtain Therefore, the required terms are 1 1 1 5 , , , 6 6 2 6 and th n term is 7 6 . a n 2n 3 6 Question 5: Write the first five terms of the sequences whose Solution 5: Substituting n 1,2,3,4,5 , we obtain th n term is a n 1 1 n 1 5 n **11** **11** 2 a 1 1 5 5 25 21 21 3 a 2 1 5 5 125 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 12 - Introduction

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Class XI Chapter 15 - Statistics Ma

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