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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.The Association of Teachers of Mathematics

Ask some one to pick a number from 1 to 1000. You are allowed to ask ten questions to find the number which they can answer yes or no. What should you ask?

Answer: Is it above 500? etc, keep halving, asking if above or below


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