👤

Calculati urmatoarele sume:
b)S=3+6+9+...+2013
c)S=5+10+15+...+500vaaaa rog
vvvvvvvvvaaaaaaaaaaaaa rrrrrrrrrrrrrrrrrrrrrroooooooooooooooooooooogggggggggggggggggggggg  mmmmmmmmmmmmmmmmmmmmmmuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuullllllllllllllllllllllllllllllllllllllllllllllllllltttttttttttttttttttttttttttttttttttttttttttttttttt