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1 albun_?file 70 albume_2100 file 69 albume_?file

Răspuns :

1 album............................? file
70 albume ....................2100 file
69 albume ......................? file
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2100 : 70 = 30 file ( un album)
30 x 69 = 2070 file ( 69 albume).