Dice acts using sex dice. Dice may have numbers that do not form a counting sequence starting at one. One variation on the standard die is known as the "average" die. These are six-sided dice with sides numbered codice_3, which have the same arithmetic mean as a standard die (3.5 for a single die, 7 for a pair of dice), but have a narrower range of possible values (2 through 5 for one, 4 through 10 for a pair). They are used in some table-top wargames, where a narrower range of numbers is required. Other numbered variations include Sicherman dice and
Dice notation the probability curve towards the higher numbers, as a result a roll of 3 can only occur when all four dice come up 1 (probability 1/1296), while a roll of 18 results if "any" three dice are 6 (probability 21/1296 = 7/432). Rolling three or more dice gives a probability distribution that is approximately Gaussian, in accordance with the central limit theorem. In some games, the above notation is expanded to allow for a multiplier, as in A"d"X"×"C or C"×d"X, where: For example, Multiplication can also mean repeating throws of similar setup (usually represented by the letter, x, rather than