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  2. Parity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Parity_(mathematics)

    Even and odd numbers have opposite parities, e.g., 22 (even number) and 13 (odd number) have opposite parities. In particular, the parity of zero is even. [2] Any two consecutive integers have opposite parity. A number (i.e., integer) expressed in the decimal numeral system is even or odd according to whether its last digit is even or odd. That ...

  3. Odds and evens (hand game) - Wikipedia

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

    The sum total of fingers displayed is either odd or even. If the result is odd, then the person who called even is the victor, and can decide the issue as they see fit. [7] [8] [9] Often, the participants continue to shoot for a best two out of three. [10] From a game-theoretic perspective, the game is equivalent to matching pennies. See that ...

  4. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    Minor aspects of the presentation are adjustable, for example the cards can be dealt either face-up or face-down. If they are dealt face-down then the spectator must look through each of the piles until finding which one contains the selected card, whereas if they are dealt face-up then an attentive spectator can immediately answer the question of which pile contains the selected card.

  5. Round-robin tournament - Wikipedia

    en.wikipedia.org/wiki/Round-robin_tournament

    For an even number or an odd number of competitors, Schurig [20] builds a table with / vertical rows and horizontal rows. Then he populates it starting from the top left corner by repeating the sequence of numbers from 1 up to n − 1 {\displaystyle n-1} .

  6. Prime number - Wikipedia

    en.wikipedia.org/wiki/Prime_number

    Therefore, every prime number other than 2 is an odd number, and is called an odd prime. [10] Similarly, when written in the usual decimal system, all prime numbers larger than 5 end in 1, 3, 7, or 9. The numbers that end with other digits are all composite: decimal numbers that end in 0, 2, 4, 6, or 8 are even, and decimal numbers that end in ...

  7. Morra (game) - Wikipedia

    en.wikipedia.org/wiki/Morra_(game)

    The game can be expanded for a larger number of players by using modular arithmetic. For n players, each player is assigned a number from zero to n−1. On the count of three, each player holds out any number of fingers less than n, including zero. The person whose number is the remainder of the sum is chosen.

  8. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    This is a list of articles about prime numbers. A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.

  9. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Even and odd numbers: An integer is even if it is a multiple of 2, and is odd otherwise. Prime number: A positive integer with exactly two positive divisors: itself and 1. The primes form an infinite sequence 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, ...