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How did the mathematician Gauss quickly calculate the addition formula from 1 to 100 when he was a child?
1+99= 100

2+98= 100

An analogy, and the last one is

49+5 1= 100

The remaining 50 and 100.

So when 1 plus 100, it is 49 *100+50+100 = 5050.

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