( 920 ) 
yee ik a | 
/ ES ae nia 1 — a Spe 
Kal 1 1 8 | 
ee a en Er ENE ee = ek | 
uv fence ok a, 2da da | | 
yi RN U AF — a = : 
142 Ê 2 1 8 8 i 8a, | 
: a, da a, da 
Mao = An*n?a,' {r — -~—a,+ da + —— — 
7 8 8 
Vv Anna \ a a, Ada doa" 
WIRED IV am Ne fe — a = 
= >| RE Sa, 
uf / a, da sige dik ee da | 
My 3 = 4 NA USF a Se da — —— + 
i de r + 8 8 8a, \ 
2a, da 2da 
Ms3= 42°n*a,? (r — —— — a, + 20a +3 aa ag 
7 
ef PERSEN aks 6 da | Ida" | 
/ = Aen ; —a = — 
1.4 ma, 57 1 rs 8 its 8a, | 
5 nee a,da rae a, jda Ada’ 
Mir WANT ED a, + da + PRE) ei (6) 
7 4 2a,da ee Ada da. | 
= 4n’n’a, EE l ada — — + = — 
Lach ‘ r B e g 5" 8a, \ 
da, da a, Ja 
Maa An n'a, (7 — —— — a, + dda + — — — 
r 8 8 
u 4 4 a, 8da | 16da 
Ms; 4 na; —a, 3 a 8a, 
M ae a,da rie a, Tda Ida | 
LMS =e NT Pe = LI ek is 
a iS BAE 8a, | 
uv oe | 2a, da 426 a, 6da Ada’ } 
Mes ATE NU Peen ea 402 =- — — — = 
is a r i 8 5 a) Sa, 
M iy ; | sa, da 4349 a, 5da da’ 
== Anna.” Ar = de edu — — 
i ; | r es) 8 8a, 
le Aa da a, Ada 
Ms, — 4a'n'a, Ar — —— — a, + 4da 4+ — — — | 
are a cae 
ele. 
The law of succession for the numerical coefficients of the terms 
within the brackets, in each group with the same factor before the 
brackets, is very evident, so that the sum is easily found. 
