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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. 2012 United States presidential election - Wikipedia

   en.wikipedia.org/wiki/2012_United_States...

   The 2012 United States presidential election was the 57th quadrennial presidential election, held on Tuesday, November 6, 2012. Incumbent Democratic President Barack Obama and his running mate, incumbent Vice President Joe Biden, were re-elected to a second term. [ 3] They defeated the Republican ticket of former Governor Mitt Romney of ...

4. Avatar (2009 film) - Wikipedia

   en.wikipedia.org/wiki/Avatar_(2009_film)

   Box office. $2.923 billion [5] Avatar is a 2009 epic science fiction film directed, written, co-produced, and co-edited by James Cameron. The cast includes Sam Worthington, Zoe Saldana, Stephen Lang, Michelle Rodriguez and Sigourney Weaver. [6] It is the first installment in the Avatar film series. It is set in the mid-22nd century, when humans ...

5. Universal Product Code - Wikipedia

   en.wikipedia.org/wiki/Universal_Product_Code

   A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...

6. Wikipedia:Protection policy - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Protection_policy

   Extended confirmed protection, previously known as 30/500 protection, prevents the action if the user's account is not extended confirmed (at least 30 days old with more than 500 edits). In most cases, it should not be a protection level of first resort, and should be used where semi-protection has proven to be ineffective.

7. Computer security - Wikipedia

   en.wikipedia.org/wiki/Computer_security

   An example of a physical security measure: a metal lock on the back of a personal computer to prevent hardware tampering. Computer security (also cybersecurity, digital security, or information technology (IT) security) is the protection of computer software, systems and networks from threats that may result in unauthorized information disclosure, theft of (or damage to) hardware, software, or ...