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  2. Extension (telephone) - Wikipedia

    en.wikipedia.org/wiki/Extension_(telephone)

    In business telephony, a telephone extension may refer to a phone on an internal telephone line attached to a private branch exchange (PBX) or Centrex system. The PBX operates much as a community switchboard does for a geographic telephone numbering plan and allows multiple lines inside the office to connect without each phone requiring a ...

  3. List of mobile telephone prefixes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_telephone...

    All mobile phone numbers start with "2" and each of them has 8 digits (without country code),. For example: 371 2 63 12345 Lebanon +961: 03: 8 (03-Abcdef) where A is 1/2/3/4/5 for Alfa and 0/6/7/8/9 for Touch: 70 +8 (70-Abcdef) where A is 1/2/3/4/5 for Alfa and 0/6/7/8/9 for Touch: 71 (71-Abcdef) where A is 1/2/3/4/5 for Touch and 0/6/7/8/9 for ...

  4. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    If an unknown weight W is balanced with 3 (3 1) on its pan and 1 and 27 (3 0 and 3 3) on the other, then its weight in decimal is 25 or 10 1 1 in balanced base-3. 10 1 1 3 = 1 × 3 3 + 0 × 3 21 × 3 1 + 1 × 3 0 = 25.

  5. Rotary dial - Wikipedia

    en.wikipedia.org/wiki/Rotary_dial

    The Australian letter-to-number mapping was A=1, B=2, F=3, J=4, L=5, M=6, U=7, W=8, X=9, Y=0, so the phone number BX 3701 was in fact 29 3701. When Australia around 1960 changed to all-numeric telephone dials, a mnemonic to help people associate letters with numbers was the sentence, "All Big Fish Jump Like Mad Under Water eXcept Yabbies ."

  6. 1/2 + 1/4 + 1/8 + 1/16 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%2B_1/4_%2B_1/8_%2B_1/...

    In mathematics, the infinite series ⁠ 1 / 2 ⁠ + ⁠ 1 / 4 ⁠ + ⁠ 1 / 8 ⁠ + ⁠ 1 / 16 ⁠ + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1.

  7. Add or disable 2-step verification for extra security - AOL Help

    help.aol.com/articles/2-step-verification...

    The phone number we contact you with may be different each time. Enable 2-step for phone. 1. Sign in to your Account Security page. 2. Next to "2-Step Verification," click Turn on. 3. Select Phone number for your 2-step verification method. 4. Follow the on-screen prompts to complete the process. Sign in with 2-step for phone. 1.

  8. Half-precision floating-point format - Wikipedia

    en.wikipedia.org/wiki/Half-precision_floating...

    In IEEE 754 parlance, there are 10 bits of significand, but there are 11 bits of significand precision (log 10 (2 11) ≈ 3.311 decimal digits, or 4 digits ± slightly less than 5 units in the last place).

  9. 2-Step Verification with a Security Key - AOL Help

    help.aol.com/articles/2-step-verification-with-a...

    When you get your Security Key back or get a new key, you can re-enable 2-Step Verification in your Account Security settings. Still need help? Call paid premium support at 1-800-358-4860 to get live expert help from AOL Customer Care.