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

70%

11%

France

66%

16%

Canada

54%

22%

13%

Poland

51%

10%

24%

12%

2852

India

45%

21%

15%

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26%

12%

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23%

the United Kingdom

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25%

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18%

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