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  2. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    Casting out nines. Casting out nines is any of three arithmetical procedures: [1] Adding the decimal digits of a positive whole number, while optionally ignoring any 9s or digits which sum to 9 or a multiple of 9. The result of this procedure is a number which is smaller than the original whenever the original has more than one digit, leaves ...

  3. Method of complements - Wikipedia

    en.wikipedia.org/wiki/Method_of_complements

    The smaller numbers, for use when subtracting, are the nines' complement of the larger numbers, which are used when adding. In mathematics and computing, the method of complements is a technique to encode a symmetric range of positive and negative integers in a way that they can use the same algorithm (or mechanism) for addition throughout the ...

  4. Nines (notation) - Wikipedia

    en.wikipedia.org/wiki/Nines_(notation)

    Nines are an informal logarithmic notation for proportions very near to one or, equivalently, percentages very near 100%. Put simply, "nines" are the number of consecutive nines in a percentage such as 99% (two nines) [1] or a decimal fraction such as 0.999 (three nines). Their common uses include grading the purity of materials – especially ...

  5. High availability - Wikipedia

    en.wikipedia.org/wiki/High_availability

    High availability (HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. [1] Modernization has resulted in an increased reliance on these systems. For example, hospitals and data centers require high availability of their systems to perform routine ...

  6. Uniformed services pay grades of the United States - Wikipedia

    en.wikipedia.org/wiki/Uniformed_services_pay...

    Structure. Pay grades are divided into three groups: [1] enlisted (E), warrant officer (W), and officer (O). Enlisted pay grades begin at E-1 and end at E-9; warrant officer pay grades originate at W-1 and terminate at W-5; and officer pay grades start at O-1 and finish at O-10. [a] Not all of the uniformed services use all of the grades; for ...

  7. Group 17 Rugby League - Wikipedia

    en.wikipedia.org/wiki/Group_17_Rugby_League

    Group 17 Rugby League. Group 17 is a rugby league competition based in the Riverina and Central West regions of New South Wales, Australia. The competition collapsed in 2006 and reformed in 2018 as the Western Riverina Community Cup with six teams. It is currently sponsored by a chicken farm company called Proten which has been sponsoring the ...

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