Nota del Plana i85 



Si possono pertanto stabilire le equazioni 



.// .x/ ,.x, V « \ 1.3.5 .... 2« — 1 



M{n •+■ i){n H- 2)(n -h 3) . . . . 2n) = - 



A'/(w— 1)n(w4-1)(w-4-2) ... (2n— 2)W 



2.3 T. 



1 1.3.5...2«— ; 



2 1.2.3... n— 2' 

 1 1.3.5....2n— 5 



A'Y (n — 3)(«— 2)(«— 1 )n ... (2w— 4) W - . , 



V i\ n / \ >j 2.4 1.2.3 ....n— 4' 



A'"((n-5)(n-4)(Ai-3) .. . . (2n-6)\-=. ^ ^ .3.5...2n-7 



ec. 



ossia queste; 



a((«+1)(„+2)(»+3) ^^-^^.^^...^i..^.. 



2.4.6 ' 1.2.3... n— 6' 

 ec. 



1.2.3 2« 



A'((n-1)(n)(n+1) .... (2n~2)\=^ — . ^-3-2>^-2 



V '^ '^ ^ V /; 2(n— 1) (1.2.3...n)^2"-»' 



^"((n-3)(«-2)(n-.1)...(2n>-4)U ^- ^ •2.i...2n-^^ 



\ '^ '^ ' ^ 7 2.4(n-3)(«-2) (1.2.3...w-4)^2«-2- 



/^'((^_5)(n~4)(n-3)...(2n-6))=---— i— 



1.2.3....2/1— 6 



.6(n-5)(n-4)(n-3) • (1.2.3...n-6)».2"-3' 

 ec. 



