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OpenStudy (anonymous):
Use Gauss's approach (not formula ) to find the sum of 1+2.....+200
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OpenStudy (phi):
I think Gauss wrote the numbers like this 1+ 2 + 3 + ... 200 + 199 + 198 + ... if you add up the pairs you get 201 + 201 + 201 + .... now you need to figure out how many pairs you have.
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