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  2. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...

  3. School voucher - Wikipedia

    en.wikipedia.org/wiki/School_voucher

    A school voucher, also called an education voucher in a voucher system, is a certificate of government funding for students at schools chosen by themselves or their parents. Funding is usually for a particular year, term, or semester. In some countries, states, or local jurisdictions, the voucher can be used to cover or reimburse home schooling ...

  4. List of open-source software for mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_open-source...

    This free software had an earlier incarnation, Macsyma. Developed by Massachusetts Institute of Technology in the 1960s, it was maintained by William Schelter from 1982 to 2001. In 1998, Schelter obtained permission to release Maxima as open-source software under the GNU General Public license and the source code was released later that year.

  5. Best Coupon Websites, Browser Extensions and Apps - AOL

    www.aol.com/news/best-coupon-websites-browser...

    Here are 17 sites, apps and browser tools that deliver deals effortlessly so you can save money with just a couple of clicks or taps of your finger. Best Coupon Websites, Browser Extensions and ...

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. PromotionCode.org - Wikipedia

    en.wikipedia.org/wiki/PromotionCode.org

    PromotionCode.org is a free resource for online shoppers and maintains affiliate partnerships with major retailers such as Target, Wal-Mart, HP and Verizon. The site both originates and disseminates print coupons and online promotion codes. PromotionCode.org maintains a community of shoppers that exchange user-submitted codes and a codes-by ...

  8. Buy one, get one free - Wikipedia

    en.wikipedia.org/wiki/Buy_one,_get_one_free

    Buy one, get one free. " Buy one, get one free " or " two for the price of one " is a common form of sales promotion. Economist Alex Tabarrok has argued that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion ...

  9. Z-Library - Wikipedia

    en.wikipedia.org/wiki/Z-Library

    Z-Library (abbreviated as z-lib, formerly BookFinder) is a shadow library project for file-sharing access to scholarly journal articles, academic texts and general-interest books. It began as a mirror of Library Genesis, but has expanded dramatically. [ 7][ 8]