I’ll be back at 5pm GMT with the solution. The puzzle is adapted from one by Prem Prakash, an electrical engineer from Bangalore, India, who has taken early retirement to develop puzzle-based teaching workshops, and also as posts daily puzzles on Twitter. We can also assume that you and your friends are all perfect logicians. I like this puzzle because it is a clever combination of two classic types of logic problem, so-called “common knowledge” problems where the protagonists have both private and public information, and truth-telling problems where you must devise a question that gets you the desired outcome from a “Yes” or a “No”.įor those of you who have forgotten what prime numbers are, they are the numbers that are divisible only by themselves and 1. He will free you only if one of you tells him the total number of apples in all the cells. Every one hears the questions and the answers. The rules of the challenge are as follows: The three of you will ask Kurt a single question each, which he will answer truthfully ‘Yes’ or ‘No’. You are told that each cell has at least one apple, and at most nine apples, and no two cells have the same number of apples. Each of you can count the number of apples in your own cell, but not in anyone else’s. This is where Greg was on the evening of Wednesday, September 15, 2010, in Room 348 of the MCM Elegant Hotel, in Beaumont, Texaslounging, smoking, snacking on a Reese’s Crispy Crunchy bar. The three of you are put in adjacent cells. In order to gain your freedom, the gang’s chief, Kurt, sets you this fearsome challenge. After three months of research and examination, Achim Baqu with help from the PSA had finally solved the mystery: I t was Apple co-founder Steve Jobs who had penned those numbers. You and your two friends Pip and Blossom are captured by an evil gang of logicians.
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