Question
注砖专讬诐 讗谞砖讬诐 注讜诪讚讬诐 讘讟讜专, 讘讝讛 讗讞专 讝讛. 讻诇 讗讞讚 诪讛诐 讛讜讗 讗讜 砖拽专谉 讗讜 讚讜讘专 讗诪转 (讛砖拽专谞讬诐 转诪讬讚 诪砖拽专讬诐, 讜讚讜讘专讬 讛讗诪转 转诪讬讚 讗讜诪专讬诐 讗转 讛讗诪转). 讻诇 讗讞讚 诪讛讗谞砖讬诐 讗讜诪专 砖讬讜转专 砖拽专谞讬诐 注讜诪讚讬诐 诇驻谞讬讜 诪讗砖专 诪讗讞讜专讬讜. 讻诪讛 诪讘讬谉 讛注砖专讬诐 讛诐 讚讜讘专讬 讗诪转?
Difficulty level (1 very easy - 10 very hard): 2
Topics:
Logic
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Reasoning / Logic
Combinatorics
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Case Analysis / Checking Cases
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Processes / Procedures
Logic
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Truth-tellers and Liars Problems
- Israeli IMO Selection, 2011, Stage A Question 1
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