What is the sum of all even numbers between 1 and 100?

5050

1000

5555

10000

1+2+...+99+100 = 1+100+2+99+...+50+51 = 101+101+101+...+101 = 101*50 = 5050 It's a calculation method invented by Gauss.

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the Netherlands

66%

11%

16%

France

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16%

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60%

30%

10%

Canada

54%

22%

13%

Germany

53%

11%

19%

Poland

51%

10%

24%

12%

2949

the United States

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26%

10%

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15%

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32%

16%

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