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efectuati:
2+4+6+...+50=


Răspuns :

62 e asa de usoara...............
numerele care lipsesc sunt:
8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48.
2+4+6+...+50 = 3.422