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The Sum and Product Puzzle, also known as the Impossible Puzzle because it seems to lack sufficient information for a solution, is a logic puzzle. It was first published in 1969 by Hans Freudenthal, [1] [2] and the name Impossible Puzzle was coined by Martin Gardner. [3] The puzzle is solvable, though not easily. There exist many similar puzzles.
The four glasses puzzle, also known as the blind bartender's problem, [1] is a logic puzzle first publicised by Martin Gardner in his "Mathematical Games" column in the February 1979 edition of Scientific American.
Here all pieces have the same width and can be put in a perfect line segment. At present this puzzle is for instance sold by HIQU and comes with 100 figures to make and by Eureka Toys and Games in a puzzle called brain twister. [28] [29] Gardner's T: This is the version featured in Martin Gardner's Scientific American column. [6]
The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.
A lifetime of puzzles : a collection of puzzles in honor of Martin Gardner's 90th birthday A K Peters: Wellesley, MA, ISBN 1568812450 Dirda, Michael (2009). Book review by Michael Dirda: 'When You Were a Tadpole and I Was a Fish' by Martin Gardner The Washington Post , October 22, 2009
The Monty Hall problem is a brain teaser, in the form of a probability puzzle, based nominally on the American television game show Let's Make a Deal and named after its original host, Monty Hall. The problem was originally posed (and solved) in a letter by Steve Selvin to the American Statistician in 1975.
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