Răspuns :
banuiesc ca la 2011 vroiai sa scrii 2008
dam factor comun 4
4(1+2+3+4+....+503)= 4*503*504/2( suma gauss)= 108*503=5043024
dam factor comun 4
4(1+2+3+4+....+503)= 4*503*504/2( suma gauss)= 108*503=5043024