Class XI Chapter 9 – Sequences and Series Maths ______________________________________________________________________________ Question 5: Find the sum to n terms of the series Solution 5: The given series is 2 2 a n 4 n 8n 16 n n n 2 Sn ak k k k1 k1 5 6 7 ..... 20 2 2 2 2 8 16 n n n 2 k 8 k 16 k 1 k 1 k 1 12 1 8 1 n n n n n 16n 6 2 16 th term is 2 2 16 4 20 2 2 2 2 5 6 7 ..... 20 th n term, 16 16 1 2 16 1 8 16 16 1 S16 1616 6 2 16 17 33 8 16 16 1 1616 6 2 1617 33 81617 256 6 2 1496 1088 256 2840 2 2 2 2 5 6 7 ....... 20 2840 . Question 6: Find the sum to n terms of the series 3 8 6 **11** 9 14 ... Solution 6: The given series is 38 6**11** 914 ..... an th th n termof 3,6,9.... n termof 8,**11**,14.... 3n3n 5 2 9n 15 n n n k 2 Sn a 9k 15k k1 k1 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 ______________________________________________________________________________ n k 2 15 n k1 k1 k 12 1 1 n n n n n 9 15 6 2 3n n 1 2n 1 15n n 1 2 2 3nn1 2 n 1 5 2 n 3n n 1 2 6 2 n 3n n 1 3 Question 7: Find the sum to n terms of series Solution 7: The given series is 1 2 3 ..... n n n 2 2 3 2 12n 1 6 2 n 2n 3n 1 3 2 2n 3n n 1 1 1 3 2 6 6 6 3 2 n n n n Sn ak k 1 n 1 1 1 k 1 3 2 6 3 2 k k k 2 2 2 2 2 2 1 1 2 1 2 3 .... 2 2 2 2 2 2 1 1 2 1 2 3 .... an n n n 1 3 1 2 1 k k k 3 2 6 k 1 k 1 k 1 2 2 2 n n n n n n n 1 1 1 1 2 1 1 1 2 3 2 6 6 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 2 - Relations and

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Class XI Chapter 12 - Introduction

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Class XI Chapter 13 - Limits and De

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