= (93) == 



co n, rccundo /■ — I loco /, tertio — B loco 5 et quarto ^ N 

 loco N , vnde fiet quarta pars 



§. 2 8. Quoniam quatuor iflac partcs communem ha- 



bcnt factorcm hunc : .;,. 



A K .(ti-f-g — 9)(n-f-£a — tflin-(-3- — i) . ...n-H/— tW — ^ A t — i 'R& f]' T\A 



' a. tx.3:i.-+a [i — i)a a * * * ' 



lumma omnuim narum partium erit 



A /■ ( r. — ■>' m — ^l j b [n — ^) -+- c [n — y) -4- d in—^) \ 



quae exprellio euoluta, ob l> -\- c -+- d - i er lf(i-^cy-+-do-$^ 

 rcducitur ad hanc formam: l^ [« (« -f- (/ — i) a — ^], confe- 

 quenter tota (umma quatuor harum partium erit 



quac eft ipfi forma demonftranda. Vnde iam manifeftum cft 

 omnes feries hac methodo refultantes veritati effe confentanea?. 



REGVLA FACILIS ET SVCCINCTA 



omnes feries huius generis expedite formandi 



§. 2p. Propofita aequatione quacunque huius formac: 

 A . B . C . D 



X'^ X^ X7., ; X^ 



l 



tl:'^ 



jiiuj. 



ponatur breuitatis gratia 



P y L 



A aB_|-A aC-4-A «D-hetc. =:V, 



M 3 hinc* 



