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In a vigesimal place system, twenty individual numerals (or digit symbols) are used, ten more than in the decimal system. One modern method of finding the extra needed symbols is to write ten as the letter A, or A 20, where the 20 means base 20, to write nineteen as J 20, and the numbers between with the corresponding letters of the alphabet.
A repeating decimal is an infinite decimal that, after some place, ... 15 = 15.0 = 15.00 and 5.2 = 5.20 = 5. ... [12] Decimal arithmetic is used in computers so that ...
Approximating π to four decimal places: π ≈ 62832 ⁄ 20000 = 3.1416, [18] [19] [20] Aryabhata stated that his result "approximately" (āsanna "approaching") gave the circumference of a circle. His 15th-century commentator Nilakantha Somayaji ( Kerala school of astronomy and mathematics ) has argued that the word means not only that this is ...
In combinatorics, 20 is the number of distinct combinations of 6 items taken 3 at a time. Equivalently, it is the central binomial coefficient for n=3 (sequence A000984 in the OEIS). In decimal, 20 is the smallest non-trivial neon number equal to the sum of its digits when raised to the thirteenth power (20 13 = 8192 × 10 13). [citation needed]
The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.
In addition, prior to its conversion to decimal, the old British currency Pound Sterling (GBP) partially used base-12; there were 12 pence (d) in a shilling (s), 20 shillings in a pound (£), and therefore 240 pence in a pound.
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In mathematics, the decimal separator ... (in American notation), for instance, would be written 12.345. ... 3.14159 26535 89793 23846 is π rounded to 20 decimal places
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