- #1
sara_87
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Homework Statement
show that the following sequence is unbounded
{xn}= [(n+1)/n]^3 - n^3
Homework Equations
The Attempt at a Solution
I expanded it but didnt get anywhere after that. I know that a sequence is unbounded if for all M>0 there exists N such that abs(xN)>M but i still don't understand how to show it.