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Coin flipping, coin tossing, or heads or tails is the practice of throwing a coin in the air and checking which side is showing when it lands, in order to randomly choose between two alternatives. It is a form of sortition which inherently has two possible outcomes.
Penney's game, named after its inventor Walter Penney, is a binary (head/tail) sequence generating game between two players. Player A selects a sequence of heads and tails (of length 3 or larger), and shows this sequence to player B. Player B then selects another sequence of heads and tails of the same length.
Matching pennies is a non-cooperative game studied in game theory.It is played between two players, Even and Odd. Each player has a penny and must secretly turn the penny to heads or tails.
Heads and Tails may refer to: Obverse and reverse, sides of a coin; Coin flipping; Heads and Tails (card game), a solitaire card game which uses two decks of playing cards. Heads and Tails (crowd game), touching ones head or tail; Heads and Tails, a 1995 Russian Film; Heads and Tails (Russian telecast), a Ukrainian Russian-speaking travel series
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Spinner spins a pair of heads before a pair of tails or odding out. Single Tail 3.125% 1–1 Spinner spins a pair of tails before a pair of heads or odding out. 5 Odds 9.375% 28–1 Spinner spins five odds in a row ("odding out") before either a pair of heads or a pair of tails. Spinner's Bet 3.400% 15–2 Only available to the current spinner.
The probability of 20 heads, then 1 head is 0.5 20 × 0.5 = 0.5 21; The probability of getting 20 heads then 1 tail, and the probability of getting 20 heads then another head are both 1 in 2,097,152. When flipping a fair coin 21 times, the outcome is equally likely to be 21 heads as 20 heads and then 1 tail.
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