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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. Word problem (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Word_problem_(mathematics)

   In computational mathematics, a word problem is the problem of deciding whether two given expressions are equivalent with respect to a set of rewriting identities. A prototypical example is the word problem for groups, but there are many other instances as well. A deep result of computational theory is that answering this question is in many ...

4. Word problem for groups - Wikipedia

   en.wikipedia.org/wiki/Word_problem_for_groups

   Word problem for groups. In mathematics, especially in the area of abstract algebra known as combinatorial group theory, the word problem for a finitely generated group is the algorithmic problem of deciding whether two words in the generators represent the same element of . The word problem is a well-known example of an undecidable problem .

5. List of unsolved problems in mathematics - Wikipedia

   en.wikipedia.org/wiki/List_of_unsolved_problems...

   Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

6. Not taxing tips is a terrible idea - AOL

   www.aol.com/finance/not-taxing-tips-terrible...

   Republican presidential nominee Donald Trump got the idea to exempt tips from income tax after a “ very smart waitress ” in Nevada supposedly complained to him about the taxes she had to pay ...

7. Best, worst and most interesting units to watch this NFL ...

   www.aol.com/sports/best-worst-most-interesting...

   The duo finish off the show with a lightning round of their favorite individual performances from Week 1 of NFL preseason action. (3:30) J.J. McCarthy to undergo knee surgery. (10:20) Chicago ...