Răspuns :
a+a+2+a+4+a+6=b
1.cand a= 247
247+249+251+253=1000
2. cand a+2=247
245+247+249+251=992
3.cand a+4=247
243+245+247+249=984
4.cand a+6=247
241+243+245+247=976
1.cand a= 247
247+249+251+253=1000
2. cand a+2=247
245+247+249+251=992
3.cand a+4=247
243+245+247+249=984
4.cand a+6=247
241+243+245+247=976