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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.
The symbols H and T represent more generalised variables expressing the numbers of heads and tails respectively that might have been observed in the experiment. Thus N = H + T = h + t. Next, let r be the actual probability of obtaining heads in a single toss of the coin. This is the property of the coin which is being investigated.
Imagine tossing a coin, if the coin comes up heads, a green ball is placed into a box; if, instead, the coin comes up tails, two red balls are placed into a box. We repeat this procedure a large number of times until the box is full of balls of both colours.
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.
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. Subsequently, a fair coin is tossed until either player A's or player B's sequence appears as a consecutive subsequence of the coin toss outcomes. The player ...
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. These two outcomes are equally as likely as any of the other combinations that can be obtained from 21 ...
By excluding the events of two heads and two tails by repeating the procedure, the coin flipper is left with the only two remaining outcomes having equivalent probability. This procedure only works if the tosses are paired properly; if part of a pair is reused in another pair, the fairness may be ruined.
Heads or Tails, or Testa o croce, or Heads I Win, Tails You Lose, an Italian comedy film; Heads or Tails, or Pismo - Glava, a 1983 drama film by Bahrudin Čengić; Heads or Tails, or Pile ou face, a Canadian film; Heads or Tails, or J'en suis!, a Canadian film; Heads or Tails, an American drama