Gauss

Help little C.F. Gauss sum all the integers from 1 to 400.

Result

s =  80200

Solution:

s=(1+400)+(2+399)+(3+398)+...= =4002⋅(400+1)=80200s = (1+400) + (2+399) + (3+398) + ... = \ \\ = \dfrac{ 400} { 2} \cdot (400+1) = 80200

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