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  2. Quasi-experiment - Wikipedia

    en.wikipedia.org/wiki/Quasi-experiment

    A quasi-experiment is an empirical interventional study used to estimate the causal impact of an intervention on target population without random assignment. Quasi-experimental research shares similarities with the traditional experimental design or randomized controlled trial, but it specifically lacks the element of random assignment to ...

  3. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    Lucas numbers have L 1 = 1, L 2 = 3, and L n = L n−1 + L n−2. Primefree sequences use the Fibonacci recursion with other starting points to generate sequences in which all numbers are composite. Letting a number be a linear function (other than the sum) of the 2 preceding numbers. The Pell numbers have P n = 2P n−1 + P n−2.

  4. Customer service - Wikipedia

    en.wikipedia.org/wiki/Customer_service

    Customer support is a range of consumer services to assist customers in making cost-effective and correct use of a product. [ 9] It includes assistance in planning, installation, training, troubleshooting, maintenance, upgrading, and disposal of a product. [ 9] These services may even be provided at the place in which the customer makes use of ...

  5. Susilo Bambang Yudhoyono - Wikipedia

    en.wikipedia.org/wiki/Susilo_Bambang_Yudhoyono

    Service no. 25308. Susilo Bambang Yudhoyono (born 9 September 1949), commonly referred to as SBY, is an Indonesian politician and retired army general who served as the sixth president of Indonesia from 2004 to 2014 and the second Indonesian President from the military after Suharto. He founded the Democratic Party of Indonesia, he served as ...

  6. 1 + 2 + 3 + 4 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    The partial sums of the series 1 + 2 + 3 + 4 + 5 + 6 + ⋯ are 1, 3, 6, 10, 15, etc.The nth partial sum is given by a simple formula: = = (+). This equation was known ...

  7. Technical support - Wikipedia

    en.wikipedia.org/wiki/Technical_support

    Technical support, also known as tech support, is a call centre type customer service provided by companies to advise and assist registered users with issues concerning their technical products. [ 1] Traditionally done on the phone, technical support can now be conducted online or through chat. At present, most large and mid-size companies have ...

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

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

    1/2 + 1/4 + 1/8 + 1/16 + ⋯. First six summands drawn as portions of a square. The geometric series on the real line. 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. In summation notation ...

  9. Contact AOL customer support - AOL Help

    help.aol.com/articles/account-management...

    GET. Mail. Call live aol support at. 1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more.