a=1+2+3+...+548
folosind suma lui Gauss=>a=548(548+1)/2=274•549=150426 b=168+169+170+...+192 Aici poti adauga toate numerele de la 1 pana la 167 si dupa le scazi=>b=1+2+3+...+167+168+169+...+192-1-2-3-...-167=192(192+1)/2-167(167+1)/2=96•193-167•84=18,528-14,028=4500 c=15+16+17+...+52
La fel ca la b
c=1+2+3+...+14+15+16+...+52-1-2-3-...-14=52(52+1)/2-14(14+1)/2=26•53-7•15=1456-105=1351
a-b+c=150426-4500+1351=150426-3149=147277
