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The modern concept of the book test involves the magician revealing a word, phrase, or image that the spectator has selected at random. The earliest known example is a variation on the modern Twenty One Card Trick, in which a series of operations reveals the chosen item through basic mathematics. The magician first asks a spectator to choose a ...
Billet reading, or the envelope trick, is a mentalist effect in which a performer pretends to use clairvoyance to read messages on folded papers or inside sealed envelopes. It is a widely performed "standard" of the mentalist craft since the middle of the 19th century. Billet is the French term for note or letter, referring to the rectangular ...
The Wason selection task (or four-card problem) is a logic puzzle devised by Peter Cathcart Wason in 1966. [1][2][3] It is one of the most famous tasks in the study of deductive reasoning. [4] An example of the puzzle is: You are shown a set of four cards placed on a table, each of which has a number on one side and a color on the other.
Trick-taking game. A trick of four cards. North led the 10♠. Usually all players must follow suit and play a spade unless they have none. East does so with the K♠. South does not have a spade, so plays the J♦, and West the 7♥. In a notrump game, east wins the trick, having played the highest card of the suit led, unless the game is an ...
The Twenty-One Card Trick, also known as the 11th card trick or three column trick, is a simple self-working card trick that uses basic mathematics to reveal the user's selected card. The game uses a selection of 21 cards out of a standard deck. These are shuffled and the player selects one at random. The cards are then dealt out face up in ...
Odds and evens is a simple game of chance and hand game, involving two people simultaneously revealing a number of fingers and winning or losing depending on whether they are odd or even, or alternatively involving one person picking up coins or other small objects and hiding them in their closed hand, while another player guesses whether they have an odd or even number.
Tests that show whether a large number can be divided by a number from 2 to 12 1962 Oct: A collection of puzzles involving numbers, logic, and probability 1962 Nov: Some puzzles based on checkerboards: 1962 Dec: Some simple tricks and manipulations from the ancient lore of string play: 1963 Jan: The author pays his annual visit to Dr. Matrix ...
Playing time. 90 min. [citation needed] Chance. Moderate. Spades is a trick-taking card game devised in the United States in the 1930s. It can be played as either a partnership or solo/"cutthroat" game. The object is to take the number of tricks that were bid before play of the hand began.