When a man says, “I have never solved a puzzle in my life,” it is difficult to know exactly what he means, for every intelligent individual is doing it every day. If there were no puzzles to solve, there would be no questions to ask; and if there were no questions to be asked, what a world it would be!’ – Henry Ernest Dudeney
This book of mathematical brain teasers was first published as1917 to satisfy...
Angielski 
Niemiecki
Grecki
Norweski 
Francuski
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