<prompt> Kokotoa sum_n1infty frac3n-12n.  <response>: HebuS sum_n1infty frac3n-12n frac22 frac54 frac 88 frac1116 dotsb.Kisha2S sum_n1infty frac3n-12n1 2 frac52 frac8101 4 frac118 dotsb.Kuondoa mlingano wa kwanza kutoka kwa pili kunatupaS 2 frac32 frac34 frac38 dots 2 fracfrac32 1-frac12 2 3 5 . 