Question Number 79051 by 21042009 last updated on 22/Jan/20
$${Is}\:\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{\mathrm{1}}{{n}}\:{converges}\:{or}\:{diverges} \\ $$
Commented by mathmax by abdo last updated on 22/Jan/20
$${same}\:{nature}\:{of}\:\int_{\mathrm{2}} ^{+\infty} \:\frac{{dx}}{{x}}\:\:{wich}\:{diverges}\:{so}\:{this}\:{serie}\:{is}\:{divergent}... \\ $$