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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. Terrigal Sharks - Wikipedia

   en.wikipedia.org/wiki/Terrigal_Sharks

   First Grade missed the finals in 1985, but Terrigal's Reserve Grade, Third Grade and Under 18 teams each finished in a top two position. After drawing their major semi-final match twice (19-all and 8-all), the Sharks' Reserve Grade lost a second replay, 26-18. Terrigal defeated Umina 16-8 on the Tuesday night to reach the Grand Final.