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
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 ! :)
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 ! :)