S= 1+2+3+...+50
=> S=?
S=1+2+3+...+50
=>S= (1+50):2 x 50
S= 51:2x50
S= 1275
S = ( 50+1 ) x 50 :2
S = 1275
good !
The term for S is :
(50 - 1) + 1 = 50 (skull)
General S is
(50 + 1) x 50 : 2 = 1275
Answer : 1275