`a_n = ln(n^3)/(2n)` Determine the convergence or divergence of the sequence with the given n'th term. If the sequence converges, find its limit.

Expert Answers

An illustration of the letter 'A' in a speech bubbles

`a_n=(ln(n^3))/(2n)`

The first few terms of the sequence are:

`0` ,  `0.5199` ,  `0.5493` ,  `0.5199` ,  `0.4828` ,  `0.4479` ,  `0.4170` ,...

To determine if the sequence converge as the n becomes larger, take the limit of the nth-term as n approaches infinity.

`lim_(n->oo)a_n`

 `=lim_(n->oo) (ln(n^3))/(2n)`

To take the limit of this, apply  L'Hospital's Rule.

`=lim_(n->oo) ((ln(n^3))')/((2n)')`

`=lim_(n->oo) (1/n^3*3n^2)/2`

`=lim_(n->oo) (3/n)/2`

`=lim_(n->oo) 3/(2n)`

`= 3/2 lim_(n->oo) 1/n`

`=3/2*0`

`=0`

Therefore, the sequence is convergent.  And the terms converges to a value of 0. 

See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial Team