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Lucianvirgil
a fost răspuns

cate elemente are sirul urmator
13,15,17….79

Răspuns :

79-13=66
66:2=33 (ELEMENTE,AM IMPARTIT PRIN 2 FINDCA15=13+2)
19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79.