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Previously published separately, the two books aha! Gotcha and aha! Insight are here combined as a single volume. The aha! books, as they are referred to by fans of Martin Gardner, contain 144 wonderful puzzles from the reigning king of recreational mathematics. In this combined volume, you will find puzzles ranging over geometry, logic, probability, statistics, number, time, combinatorics, and word play. Gardner calls these puzzles aha! problems, that 'seem difficult, and indeed are difficult if you go about trying to solve them in traditional ways. But if you can free your mind from standard problem solving techniques, you may be receptive to an aha! reaction that leads immediately to a solution. Don't be discouraged if, at first, you have difficulty with these problems. After a while you will begin to catch the spirit of offbeat, nonlinear thinking, and you may be surprised to find your aha! ability improving.'
I. aha! Insight: Introduction; 1. Combinatorial aha!; 2. Geometry aha!; 3. Number aha!; 4. Logic aha!; 5. Procedural aha!; 6. Word aha!; II. aha! Gotcha: Preface; 1. Logic; 2. Number; 3. Geometry; 4 Probability; 5. Statistics; 6. Time.