Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

Arnab09 Group TitleBest ResponseYou've already chosen the best response.4
u know the answer? is it 209/4200 ??
 2 years ago

Arnab09 Group TitleBest ResponseYou've already chosen the best response.4
whatever be the answer, u can proceed this way and get the answer: notice that all the terms are in the form: \[1/5(n1)n(n+1) \] form so, u can write it this way: \[[(1/n1)(1/n+1)]/10n\] take the 1/10 common so, if a term is 1/r(r1)  1/r(r+1), the next term is 1/r(r+1)  1/(r+1)(r+2) when adding these two, note that the term 1/r(r+1) gets cancelled so, proceeding this way, we can get 1/1*2  1/20*21 = 209/420 multiply with 1/10, u will get 209/4200
 2 years ago

pythagoras123 Group TitleBest ResponseYou've already chosen the best response.1
But Arnab09, 1/5(n−1)n(n+1) does not quite tally with the terms for the equation. (n1) for the first term is zero, and any number multiplied by zero remains zero...
 2 years ago

Arnab09 Group TitleBest ResponseYou've already chosen the best response.4
no, here the terms start with n=2
 2 years ago

Arnab09 Group TitleBest ResponseYou've already chosen the best response.4
i have taken the middle term as n.. :)
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.0
Goodjob arnab
 2 years ago

Arnab09 Group TitleBest ResponseYou've already chosen the best response.4
oh! ok, thanx
 2 years ago

pythagoras123 Group TitleBest ResponseYou've already chosen the best response.1
Now I understand... :)
 2 years ago

Taufique Group TitleBest ResponseYou've already chosen the best response.0
given series is:: Sn=(summation form n=1 to n=19)(1/5)((1/2r)(1/r)+1/2(r+1))...expand this equation and you will get : Sn=(1/5)*(1/41/2(n+1)(n+2))....put here n=19 and Sn=209/4200..ans
 2 years ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.