Răspunsuri

2014-10-01T11:55:26+03:00
Simplu..

facem un mic artificiu ca sa putem aplica Gauss adaugam +1 si la final scadem 1, 

1+2+3+...+50 -1
Adica
50*51/2-1=
25*51-1=
1275-1=1274
2014-10-01T11:59:10+03:00
Suma lui Gauss
2+3+4+..... +50
50+49+48+....+2
--------------------------
52+52+52+.......+52

nr de termeni
(50-2)+1=49
49x52=2548
2548:2=1274