[7/9
+7/9(11/11)+7/9(111/111)]2:7/9-111/700:1/7(1+1/10+1/100)n=
7/9*(1+11/11+111/111)2:7/9-111/700:(1/7)n(1+1/10+4/100)=
(7/9)2
* 32*9/7-111/700:(1/7)n(100+10+1/100)n=
7-(111/700)
:(1/7)n * (111/100)n=7-
111/700:(111/700)n=7-111/700*(700/111)n=7-1=6
1n=1 oricare ar fi n numar natural