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Cât e suma numerelor 2+4+6+...2004

Răspuns :

S=2+4+6+..+2004
S= 2 × ( 1+2+3+..+1002)
S= 2 ×[tex] \frac{1002*1003}{2} [/tex]
S=2×[tex] \frac{1005006}{2} [/tex]
S= 2×502503
S=1005006