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Fie sirul de nr : 3,8,13,18
a) gasiti al 20-lea termen
b)calculati suma primilor 30 de termeni
Sa raspunda numai cei care stiu.


Răspuns :

3,8,13,18,23,28,33,38,43,48,53,58,63,68,73,78,83,88,93,98,103,108,113,118,123,128,133,138,143,148.
a) 98
b) 2265