Page 17 - Math Grade 11 (Basic)
P. 17
PROEUS DARA
3.
tl'l'tflS~~S~~ U 1 , U 2 , U 3 , U 4 , U 5 , U 6 '1 U 1 Stl U 6 tunrn ~~tl '1 U 2 Stl U 3
1
ttfiru sb u4 tunrnm2it~13'tfll15rl~13tl '1
IJ .... "' IJ 1
3 ' ................... ' u, '1
S" = U 1 +U 2 +U 3 + ............... +U" 1+U,,
+ Sn = Un+Un-1+ .................. +U2+U1
2S" = (U 1 + U") + (U2 + Un-l) + ............ + (U,_l + U2) + (U1 + Un)
= (U 1 + U,) + (U 1 + U,) + ............... + (U 1 + U,J
n
12
