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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Answers by country
5050
1000
5555
10000
answers
the Netherlands
17
France
12
Canada
22
Poland
2780
India
70
Germany
50
the United Kingdom
86
the United States
67
Australia
21