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  2. Subtraction game - Wikipedia

    en.wikipedia.org/wiki/Subtraction_game

    Subtraction games are generally impartial games, meaning that the set of moves available in a given position does not depend on the player whose turn it is to move.For such a game, the states can be divided up into -positions (positions in which the previous player, who just moved, is winning) and -positions (positions in which the next player to move is winning), and an optimal game playing ...

  3. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    American schools teach a method of subtraction using borrowing. [12] A subtraction problem such as is solved by borrowing a 10 from the tens place to add to the ones place in order to facilitate the subtraction. Subtracting 9 from 6 involves borrowing a 10 from the tens place, making the problem into +. This is indicated by crossing out the 8 ...

  4. Wythoff's game - Wikipedia

    en.wikipedia.org/wiki/Wythoff's_game

    Wythoff's game is played with two piles of counters. Wythoff's game is a two-player mathematical subtraction game, played with two piles of counters.Players take turns removing counters from one or both piles; when removing counters from both piles, the numbers of counters removed from each pile must be equal.

  5. Subtract a square - Wikipedia

    en.wikipedia.org/wiki/Subtract_a_square

    Subtract-a-square can also be played as a misère game, in which the player to make the last subtraction loses. The recursive algorithm to determine 'hot' and 'cold' numbers for the misère game is the same as that for the normal game, except that for the misère game the number 1 is 'cold' whilst 2 is 'hot'.

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  7. Martingale (betting system) - Wikipedia

    en.wikipedia.org/wiki/Martingale_(betting_system)

    In this example, the probability of losing the entire bankroll and being unable to continue the martingale is equal to the probability of 6 consecutive losses: (10/19) 6 = 2.1256%. The probability of winning is equal to 1 minus the probability of losing 6 times: 1 − (10/19) 6 = 97.8744%. The expected amount won is (1 × 0.978744) = 0.978744.

  8. Number line - Wikipedia

    en.wikipedia.org/wiki/Number_line

    The order of the natural numbers shown on the number line. A number line is a graphical representation of a straight line that serves as spatial representation of numbers, usually graduated like a ruler with a particular origin point representing the number zero and evenly spaced marks in either direction representing integers, imagined to extend infinitely.

  9. Investing guru James Rickards says 'it's not a guess' that ...

    www.aol.com/finance/investing-guru-james-rickard...

    If you share James Rickards’ bullish outlook on gold’s future, adding a gold IRA to your retirement strategy could be a wise and profitable decision. Goldco's expertise and trusted reputation ...