`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.
`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.
Comments
Post a Comment