Observam ca fractiile au acelasi numitor, astfel ca vom afla suma numaratorilor.
S = ( 5 + 10 + 15 + ........+ 10 065 ) / 4 026
S = 5 x ( 1 + 2 + 3 + .......+ 2 013 ) / 4026
S = 5 x 2 013 x ( 1 + 2 013 ) / 2 x 4 026
S = 5 x 2013 / 4 026 x 2014 / 2
S = 5 x 1 / 2 x 1 007
S = 5 035 / 2
S = 2 517,5
