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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. 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 ...

4. Academic grading in the United States - Wikipedia

   en.wikipedia.org/wiki/Academic_grading_in_the...

   The top grade, A, is given here for performance that exceeds the mean by more than 1.5 standard deviations, a B for performance between 0.5 and 1.5 standard deviations above the mean, and so on. [18] Regardless of the absolute performance of the students, the best score in the group receives a top grade and the worst score receives a failing grade.

5. Shop our favorite deals under $50 from Nordstrom's ... - AOL

   www.aol.com/lifestyle/shop-our-favorite-deals...

   The Nordstrom Anniversary Sale is in full swing and if you haven't shopped yet, there's still time. We combed through more than 5,000 items to find you the best deals under $50 — we're talking ...

6. 6 simple ways to save money on your prescriptions — without ...

   www.aol.com/finance/save-money-prescription...

   1. Use a coupon program. ... Coupons are free. You could save 80% or more on prescriptions. ... You'll pay up to $4.50 for generic drugs and up to $11.20 for brand-name.

7. Shoppers over 50 love this anti-aging retinol stick and today ...

   www.aol.com/lifestyle/shoppers-over-50-love-this...

   Velamo Advanced Retinol Eye Stick. $16 $30 Save $14. Shoppers in their 50s and 60s 'stick' it to dark circles and fine lines, thanks to this compact eye booster. $16 at Amazon.