Hey all i thought i understood this question, but after having another look i think my solution is wrong.
"Show that the sequence {an} is bounded, where an, is given by
$\displaystyle
a_n = \frac {(-1)^n}{n^3}
$ "
I know what if i show {an} is convergent, then it is therefore bounded.
My initial idea was to show that an was convergent by the alternating series test.
But thats the problem, its not a series.
So is my method correct, or shall i be approaching this differently?
Thanks for your help!