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  2. Social Security number - Wikipedia

    en.wikipedia.org/wiki/Social_Security_number

    List showing the geographical location of the first three digits of the Social Security numbers assigned in the United States and its territories from 1936 until June 25, 2011. Repeated numbers indicate that they have been transferred to another location or are shared by more than one location.

  3. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft released the first version of Excel for the Macintosh on September 30, 1985, and the first Windows version was 2.05 (to synchronize with the Macintosh version 2.2) on November 19, 1987. [ 101 ] [ 102 ] Lotus was slow to bring 1-2-3 to Windows and by the early 1990s, Excel had started to outsell 1-2-3 and helped Microsoft achieve its ...

  4. Social insurance number - Wikipedia

    en.wikipedia.org/wiki/Social_insurance_number

    Social Insurance Numbers can be validated through a simple check digit process called the Luhn algorithm. 046 454 286 <--- A fictitious, but valid, SIN. 121 212 121 <--- Multiply every second digit by 2. The result of the multiplication is: 0 8 6 8 5 8 2 16 6 Then, add all of the digits together (note that 16 is summed as the individual digits ...

  5. Numeric precision in Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Numeric_precision_in...

    The inaccuracy in Excel calculations is more complicated than errors due to a precision of 15 significant figures. Excel's storage of numbers in binary format also affects its accuracy. [3] To illustrate, the lower figure tabulates the simple addition 1 + x − 1 for several values of x. All the values of x begin at the 15 th decimal, so Excel ...

  6. Checksum - Wikipedia

    en.wikipedia.org/wiki/Checksum

    Check digits and parity bits are special cases of checksums, appropriate for small blocks of data (such as Social Security numbers, bank account numbers, computer words, single bytes, etc.). Some error-correcting codes are based on special checksums which not only detect common errors but also allow the original data to be recovered in certain ...

  7. 2.9 billion records, including Social Security numbers ... - AOL

    www.aol.com/2-9-billion-records-including...

    According to a post from a cybersecurity expert on X, formerly Twitter, USDoD claims to be selling the 2.9 billion records for citizens of the U.S., U.K. and Canada on the dark web for $3.5 million.