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S= 1+2+3+...+74
S= 1+2+3+...+119


Răspuns :

Suma lui Gauss
S=1+2+3+...+74 = [74(74+1)]/2=(74*75)/2=5550/2=2775


S= 1+2+3+...+119 =[119(119+1)]/2=(120*119)/2=14280/2=7140
1+2+3+...+74 = ((1+74)*74) / 2=  2775
1+2+3+...+119 = ((1+119)*119 ) / 2 =7140