1+2+3+..+90
90*(90+1)*2
45*91
4095
2+4+6+....+200
1*2+2*2+2*3+....+2*100
2*(1+2+3+...+100):2
100*(100+1)
100*101
10100
3+7+11+...+43
3*1+3*2+1+3*3+2+3*4+3+3*5+4+....+3*11+10
3*(1+2+3+4+....+11)+(1+2+3+....+10)
3*11*(11+1):2+10*(10+1):2
3*11*12:2+10*11:2
33*6+5*11
198+55
253
sper că te-am ajutat. o seara frumoasa
