series conv or div for sum (2 +(-1)^n)/(nsquarerootn)
Follow Math Help Forum on Facebook and Google+
Note that: $\displaystyle 0 < 2 + (-1)^n \leq 3$ So use the comparison test noting that: $\displaystyle \frac{2 + (-1)^n}{n \cdot n^{\frac{1}{2}}} \ \leq \ \frac{3}{n^{\frac{3}{2}}}$
why isnt the series between 1 and 3 instead of 0 and 3
View Tag Cloud