Question

Write a formula for this sequence: 1, 1, 1/10, 1/280, 1/15400, 1/1401400,.....
help, please

Answer 1

@dan815 , @surjithayer

Answer 2

this is the part where it comes from

Answer 3

Or just tell me whether it's converge or not, if it is, which value of convergence?

Answer 4

coverges

Answer 5

to where?

Answer 6

how to test? ratio? if so, need the formula of the series, right?

Answer 7

for ratio you only need a(n+1)/an
which you already have as 9/9n^2+9n+2
isn't it ?

Answer 8

yes, so just take limit when n goes to infinitive, right?

Answer 9

yup!
find limit as n-> infinity, and if L<1 it converges :)