salam 3likoum lkhawa rabi yastarkoum nasha9 t3awnouni
3awnouni fal wadifa sahitou
o minha twajdou rohkoum lal foroud 2
nabda aya bism Allah
NADA3
A=1/rac(n) *(n+1)+nrac(n+1)
ATBITH ANA
A=1/racn na9is 1/rac(n+1)
ISTANTIDJ EL MAJMOU3
S=1/2RAC1 +1RAC2 PLUS 1/3RAC2 +2RAC3 PLUS ......PLUS 1/100RAC99 +99RAC100
MOLAHADA
RAC= DJIDR