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MathNet 2003 — Part 01 Question 114

Math Olympiad Vault · MathNet 2003 — Part 01

Question 114

It is known that $n$ is a positive integer, $n \leq 144$. Ten questions of type "Is $n$ smaller than $a$?" are allowed. Answers are given with a delay: The answer to the $i$'th question is given only after the $(i+1)$'st question is asked, $i=1,2, \ldots, 9$. The answer to the tenth question is given immediately after it is asked. Find a strategy for identifying $n$.