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1. 15,20,25,…,125
2. 9,12,15,…,249
va roog urgent


Răspuns :

Se pune 12,38,...222,222,222,223,,444,,555,817,661,...81287
aflam numarul de termeni
(125-15):5+1=110:5+1=22+1=23

(249-9):3+1=240:3+1=80+1=81