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Dimceaeric1
a fost răspuns

1+2+3+4+5........+98+99+100=

1+2+3+4+5+6+...........998+999+1000=

100+101+102+103+104+............998+999+1000=

2+3+4+5+6+7+..........97+98+99=

10+11+12+13+14+15+.........+197+198+199=