Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • If Sn for a sequence is given by , then find <img alt="t_4 + t_5 +t_6" src="/latex-image/?t_4%20&plus;%20

If Sn for a sequence is given by n^2 +2n, then find t_4 + t_5 +t_6.


 

Option: 1

30


Option: 2

33


Option: 3

36


Option: 4

40


Answers (1)

best_answer

S_6=t_1+t_2+t_3+t_4 + t_5 +t_6

S_3=t_1+t_2+t_3

So, S_6-S_3=t_4+t_5+t_6

\Rightarrow t_4+t_5+t_6= S_6-S_3

                              = (6^2+2.6)-(3^2+2.3)

                              = (6^2-3^2)+(2.6-2.3)

                             = 36-9+6 = 33   

Posted by

vinayak

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

Amrita BTech Admission 2025: JEE Main-based registration deadline extended to August 30

Latest Question