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Câte numere conține şirul:
13 , 18 , 23 , 28 , ... , 238.


Răspuns :

13,18,23,28,33,38,43,48,53,58,63,68,73,78,83,88,93,98,103,108,113,118,123,128,133,138,143,148,153,158,163,168,173,178,183,188,193,198,203,208,213,218,223,228,233,238. Acest sir contine 46 de numere.