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2. Mental calculation - Wikipedia

   en.wikipedia.org/wiki/Mental_calculation

   The product of two variables ranging from 90-99 will result in a 4-digit number. The first step is to find the ones-digit and the tens digit. Subtract both variables from 100 which will result in 2 one-digit number. The product of the 2 one-digit numbers will be the last two digits of one's final product.

3. 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 ...

4. Look-and-say sequence - Wikipedia

   en.wikipedia.org/wiki/Look-and-say_sequence

   To generate a member of the sequence from the previous member, read off the digits of the previous member, counting the number of digits in groups of the same digit. For example: 1 is read off as "one 1" or 11. 11 is read off as "two 1s" or 21. 21 is read off as "one 2, one 1" or 1211. 1211 is read off as "one 1, one 2, two 1s" or 111221.

5. Benford's law - Wikipedia

   en.wikipedia.org/wiki/Benford's_law

   This is an accepted version of this page This is the latest accepted revision, reviewed on 27 September 2024. Observation that in many real-life datasets, the leading digit is likely to be small Not to be confused with the unrelated adage Benford's law of controversy. The distribution of first digits, according to Benford's law. Each bar represents a digit, and the height of the bar is the ...

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   www.aol.com/lifestyle/already-on-sale-styles-at...

   Take a look below at some of our favorite bags on sale at Kate Spade that are an extra 30% off with code EXTRA30 now through Sept. 22. Kate Spade Knott Large Shoulder Bag

7. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   Subtraction is an operation that represents removal of objects from a collection. [1] For example, in the adjacent picture, there are 5 − 2 peaches—meaning 5 peaches with 2 taken away, resulting in a total of 3 peaches. Therefore, the difference of 5 and 2 is 3; that is, 5 − 2 = 3.

8. Massachusetts Lottery - Wikipedia

   en.wikipedia.org/wiki/Massachusetts_Lottery

   The Numbers Game is played twice daily. It draws 4 1-digit numbers, bets can be made on a 1-digit and/or 2-digit number. 3-digit numbers are "first 3" or "last 3," as a 3-digit number is not drawn separately. Minimum wagers are 25 cents on a 3-digit or 4-digit number, and 50 cents on a 2-digit number or 1-digit.

9. Psychological pricing - Wikipedia

   en.wikipedia.org/wiki/Psychological_pricing

   Psychological pricing (also price ending or charm pricing) is a pricing and marketing strategy based on the theory that certain prices have a psychological impact. In this pricing method, retail prices are often expressed as just-below numbers: numbers that are just a little less than a round number, e.g. $19.99 or £2.98. [1]