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2014-08-13T13:37:46+03:00
1+2+3+    .........................+73=
73+72+.............................+1=
-----------------------------------------------------
74+74+...............................+74
nr. de termeni   73-1+1=73
73x74=5402
2S=5402
1s=2701
6 3 6
2014-08-13T13:39:51+03:00