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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.
By the Fermat polygonal number theorem, every number is the sum of at most 12 dodecagonal numbers. D n {\displaystyle D_{n}} is the sum of the first n natural numbers congruent to 1 mod 10. D n + 1 {\displaystyle D_{n+1}} is the sum of all odd numbers from 4n+1 to 6n+1.
Denominate numbers are further classified as either simple, meaning a single unit is given, or compound, meaning multiple units are given.For example, 6 kg is a simple denominate number, while 324 yards 1 foot 8 inches is a compound denominate number.
There are multiple size types, designed to fit somewhat different body shapes. Variations include the height of the person's torso (known as back length), whether the bust, waist, and hips are straighter (characteristic of teenagers) or curvier (like many adult women), and whether the bust is higher or lower (characteristic of younger and older women, respectively).
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If the number of digits is odd, subtract the first and last digit from the rest. The result must be divisible by 11. 14,179: the number of digits is odd (5) → 417 − 1 − 9 = 407: 0 − 4 − 7 = −11 = −1 × 11. 12: It is divisible by 3 and by 4. [6] 324: it is divisible by 3 and by 4. Subtract the last digit from twice the rest.
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