Mathematical focus
28-October-2015 Wednesday
Sberbank online, tricks
19-September-2015 Saturday
Guess the date of birth
17-April-2014 Thursday
Broke the system.
08-February-2014 Saturday
Counting Genius
04-December-2013 Wednesday
Oh that math trick!
03-November-2013 Sunday
I know your math tricks =)
03-November-2013 Sunday
It also happens...
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