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2. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/Coupon_collector's_problem

   Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

3. Coupon - Wikipedia

   en.wikipedia.org/wiki/Coupon

   Food stuff ration coupons types I–V for direct ... Coca-Cola's 1888-issued "free glass of" is the earliest documented coupon. [6] [7] Coupons were mailed to ...

4. Steam (service) - Wikipedia

   en.wikipedia.org/wiki/Steam_(service)

   Steam Coupons, which was introduced in December 2011, provides single-use coupons that provide a discount to the cost of items. Steam Coupons can be provided to users by developers and publishers; users can trade these coupons between friends in a similar fashion to gifts and in-game items. [ 81 ]

5. List of Internet top-level domains - Wikipedia

   en.wikipedia.org/wiki/List_of_Internet_top-level...

   .coupon: discounts and rebates: Amazon Registry Services, Inc. [11] Yes .coupons: Coupon pages, coupon sites, discount sites, coupon-themed blogs, bargain hunters — Identity Digital: Yes: Yes .courses: education: Open Universities Australia Pty Ltd [11] Yes .cpa: accountants and accounting firms: Restricted to licensed CPAs and CPA firms

6. Dark web - Wikipedia

   en.wikipedia.org/wiki/Dark_Web

   The dark web is the World Wide Web content that exists on darknets: overlay networks that use the Internet but require specific software, configurations, or authorization to access.

7. Coupon (finance) - Wikipedia

   en.wikipedia.org/wiki/Coupon_(finance)

   Zero-coupon bonds are those that pay no coupons and thus have a coupon rate of 0%. [ 6 ] [ 7 ] [ 8 ] Such bonds make only one payment: the payment of the face value on the maturity date. Normally, to compensate the bondholder for the time value of money , the price of a zero-coupon bond will always be less than its face value on any date of ...