BOOK OF MATHEMATICAL PROBLEMS. 



W 1.3 + 1.3.5 + + 1.3.5...(2n+l)' 



3 + O + 3.7.11 + + 3.7.11...(4-1) 



1 5 n' + n-l 



49 2n* + 3n - 1 



8 ' 



5.10 10.17 (l + n'){l + (n+ 1) 8 } 



1 cc 



( ) /i , ^\ / 1 _L ^- a \ n j_ ^ 2 \ / 1 _i_ ->. j \ "*" 



... + 



(13) ^+ " *' " rf a ' 



(H) 



_ 

 l+ 4 " " 



x(l-ax) 



a;(l-a 8 a;) 

 (1 + ax) (1 + a'x) (1 + o a aj) 



(l-f-a-^^-fa^^ + a^ 1 ^) 



' / ^\ /, . o_\ 



+ r) (p + 2r) (p 



2r) ... 



