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suma lui Gauss=10+12+14+....+98

Răspuns :

10+12+14+...+98 = 2*(1+2+3+4+5+6+7+...+49-1-2-3-4)

Gauss: [n*(n+1)]/2 = 49*50/2= 1225

1225-1-2-3-4 = 1215
1215*2= 2430
S=10+12+14+...+98=
S+2(1+2+3+...+49-1-2-3-4)
S=2(49x50/2-10)
S=49x50-20
S=2450-20
S=2430


Sper ca te-am ajutat ! :)