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  2. File:Binary guess number trick SMIL.svg - Wikipedia

    en.wikipedia.org/wiki/File:Binary_guess_number...

    binary guess number trick SMIL: Image title: Example of a party trick to guess the day of month using binary numbers by CMG Lee. In the SVG file, click each card to specify whether the number is on it. The prediction is the number which is not struck out. Width: 100%: Height: 100%

  3. Bulls and cows - Wikipedia

    en.wikipedia.org/wiki/Bulls_and_Cows

    The numerical version of the game is usually played with four digits, but can be played with any number of digits. On a sheet of paper, the players each write a four-digit secret number. The digits must be all different. Then, in turn, the players try to guess their opponent's number who gives the number of matches.

  4. Billet reading - Wikipedia

    en.wikipedia.org/wiki/Billet_reading

    Suggested methods for Bert Reese's billet reading.. Billet reading has been a popular trick for mentalists and mediums and spiritualists.It was one of the main acts that brought fame to Charles H. Foster, an American medium who popularized a version using folded slips some time in the 1850s or 60s.

  5. Book test - Wikipedia

    en.wikipedia.org/wiki/Book_test

    These can be distinguished because the mentalist hands the books to the spectator to choose among, and has some sort of riffle or fast flipping of the pages later in the trick. [5] Methods using a modified book, a gimmick, allow free selection of the word from any page. In cases using the dictionary test principle, the magician holds the book ...

  6. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    Mathematical explanation of the Twenty-one card trick with 27 cards: In each step, the cards are dealt into three piles. The piles are accumulated with the pile containing the target card (shaded yellow and labelled with the step number) put in the middle. After three steps, the middle card (*) is the one in all chosen piles.

  7. Guess 2/3 of the average - Wikipedia

    en.wikipedia.org/wiki/Guess_2/3_of_the_average

    Intuitively, guessing any number higher than ⁠ 2 / 3 ⁠ of what you expect others to guess on average cannot be part of a Nash equilibrium. The highest possible average that would occur if everyone guessed 100 is ⁠66 + 2 / 3 ⁠. Therefore, choosing a number that lies above ⁠66 + 2 / 3 ⁠ is strictly dominated for every player. These ...

  8. Odds and evens (hand game) - Wikipedia

    en.wikipedia.org/wiki/Odds_and_evens_(hand_game)

    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.

  9. Induction puzzles - Wikipedia

    en.wikipedia.org/wiki/Induction_puzzles

    Now, we label every sequence in each class with either a 0 or a 1. First, we label the representative sequence with a 0. Then, we label any sequence which differs from the representative sequence in an even number of places with a 0, and any sequence which differs from the representative sequence in an odd number of places with a 1.