• Support PF! Buy your school textbooks, materials and every day products Here!

Find the sum

  • Thread starter razored
  • Start date
  • #1
172
0
[tex]\Sigma_{n=1}^{ \infty} \frac{1}{(3n-2)(3n+1)} [/tex] I simplified it to partial fractions to (1/3) / (3n-2) - (1/3) / (3n+1) Now what?
 

Answers and Replies

  • #2
Dick
Science Advisor
Homework Helper
26,258
618
An infinite number of terms cancel and a finite number of terms don't. Figure out which ones don't. Start writing out terms in the partial fraction expansion for n=1,2,3,4,5... if you need to. You should see the pattern pretty quickly.
 

Related Threads for: Find the sum

  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
4
Views
858
  • Last Post
Replies
2
Views
903
  • Last Post
Replies
9
Views
1K
  • Last Post
Replies
6
Views
922
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
7
Views
3K
  • Last Post
Replies
3
Views
949
Top