448 Aloysh Casinelli 



aa-^a' b 



da + rb 



/ia-\-/\.^b 



(i,a-{- n' b 



Notis regulis inveniemus P = 0, P. = 0, Ps^O . .Pa = alque 



(n^-l)...2 , 

 11 -t- 1 i . . .n 



(n + 2)...4 .,n-i 



,(/i + 3)...G ,,n-2 

 II -♦- 4 A . . . (/» — 6 ) 



etc. etc. etc. 



2 n -4- 1 ,2 n -♦- 1 



P =(2«4-1)« 4-(2?i+.1)6 



2 n -t- 1 



sen 



= (2k-M)«6 



-_±^ = (2«^-1)-^-3-«'^ 



-i;:;:-3=^'"-*-'> — t"! — '^ ' 



P « 4- 4 ( R 4. 3 )...(« — 2) , n - 3 



etc. etc. etc. 



P2«4-1 2n + 1 2n-^-1 



— =: a +0 



2«-4-1 



