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  2. Missing dollar riddle - Wikipedia

    en.wikipedia.org/wiki/Missing_dollar_riddle

    There seems to be a discrepancy, as there cannot be two answers ($29 and $30) to the math problem. On the one hand it is true that the $25 in the register, the $3 returned to the guests, and the $2 kept by the bellhop add up to $30, but on the other hand, the $27 paid by the guests and the $2 kept by the bellhop add up to only $29. Solution

  3. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration camp .

  4. Discounting - Wikipedia

    en.wikipedia.org/wiki/Discounting

    Discounting. In finance, discounting is a mechanism in which a debtor obtains the right to delay payments to a creditor, for a defined period of time, in exchange for a charge or fee. [1] Essentially, the party that owes money in the present purchases the right to delay the payment until some future date. [2]

  5. AM–GM inequality - Wikipedia

    en.wikipedia.org/wiki/AM–GM_inequality

    Visual proof that (x + y)2 ≥ 4xy. Taking square roots and dividing by two gives the AM–GM inequality. [1] In mathematics, the inequality of arithmetic and geometric means, or more briefly the AM–GM inequality, states that the arithmetic mean of a list of non-negative real numbers is greater than or equal to the geometric mean of the same ...

  6. Here’s how much more you’ll spend on your Fourth of ... - AOL

    www.aol.com/finance/much-more-ll-spend-fourth...

    The cheapest Fourth of July barbecue bill is in the Northeast at $63.54, according to the American Farm Bureau. Consumers will spend a bit more in the South and the Midwest, at $68.33 and $68.26 ...

  7. Tables of historical exchange rates to the United States ...

    en.wikipedia.org/wiki/Tables_of_historical...

    Tables of historical exchange rates to the United States dollar. Listed below is a table of historical exchange rates relative to the U.S. dollar, at present the most widely traded currency in the world. [1] An exchange rate represents the value of one currency in another. An exchange rate between two currencies fluctuates over time.

  8. Pearson correlation coefficient - Wikipedia

    en.wikipedia.org/wiki/Pearson_correlation...

    The p-value for the permutation test is the proportion of the r values generated in step (2) that are larger than the Pearson correlation coefficient that was calculated from the original data. Here "larger" can mean either that the value is larger in magnitude, or larger in signed value, depending on whether a two-sided or one-sided test is ...

  9. When’s the last time you were angry? Just recalling the ...

    www.aol.com/finance/last-time-were-angry-just...

    Here’s what to know about the calcium score test’s benefits One secret to preventing dementia, diabetes, and heart disease may lie in your oral health habits. Here’s the dental routine to follow

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