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1+2+3+......+201+202=

Răspuns :

folosesti Suma lui Gauss
202x(202+1):2=
20503
[tex]\displaystyle 1+2+3+...+201+202= \frac{202(202+1)}{2} = \frac{202 \times 203}{2} = \\ \\ =\frac{41006}{2} =20503[/tex]