Recent content by marky1

Hi, I would like to as you you help please with finding whether the following three series converge. \sum_{1}^{\infty} (-1)kk3(5+k)-2k $$\sum_{k=1}^\infty(-1)^kk^3(5+k)^{-2k}$$ \sum_{2}^{\infty} sin(Pi/2+kPi)/(k0.5lnk) $$\sum_{k=2}^\infty\frac{\sin\left(\frac{\pi}{2}+k\pi\right)}{\sqrt k\ln...