Răspuns:
2(1+2+3+...+1002)=2(1002•1003)/2=1005006
5(1+2+3+...+110)=5(110•111)/2=30525
3(1+2+3+...+400)=3(400•401)/2=240600
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Răspuns:
2(1+2+3+...+1002)=2(1002•1003)/2=1005006
5(1+2+3+...+110)=5(110•111)/2=30525
3(1+2+3+...+400)=3(400•401)/2=240600