## anonymous one year ago How do you solve this? (Explain please)

1. anonymous

$\sum_{n=1}^{3}\frac{ 1 }{ n ^{3} }$

2. anonymous

okay so basically in this problem you have to add the values of $(1/1^3) + (1/2^3) + (1/3^3)$

3. anonymous

you see that n =1 one at the bottom of the sigma

4. anonymous

5. anonymous

Oh does the three on the top mean you end with 3?

6. anonymous

yes exactly, if it was say 6 you would keep adding the equations with variables up to 6

7. anonymous

if at the bottom it said n=3 you would start at three, its a rather hard concept to wrap your head around do you get it?

8. anonymous

Oh okay. So the answer would be 195/162?

9. anonymous

fun fact if instead of a $\sum_{?}^{?} you see a \prod_{?}^{?} \it means multiply$

10. anonymous

11. anonymous

dont know havent worked it out give me a sec

12. anonymous

Alright

13. anonymous

strange i got 251/216

14. anonymous

Did u add 1 + 1/6 + 1/27?

15. LynFran

thats correct @Jdosio

16. anonymous

no you have to add 1+ 1/8 + 1/27

17. anonymous

Oh whoops! I messed up on that. Thanks!

18. anonymous

yep no problem :D