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  2. Derangement - Wikipedia

    en.wikipedia.org/wiki/Derangement

    Accordingly, the problem splits into two possible cases: P i receives a hat other than h 1 . This case is equivalent to solving the problem with n − 1 people and n − 1 hats because for each of the n − 1 people besides P 1 there is exactly one hat from among the remaining n − 1 hats that they may not receive (for any P j besides P i ...

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  4. Ratio estimator - Wikipedia

    en.wikipedia.org/wiki/Ratio_estimator

    The ratio estimator is a statistical estimator for the ratio of means of two random variables. Ratio estimates are biased and corrections must be made when they are used in experimental or survey work. The ratio estimates are asymmetrical and symmetrical tests such as the t test should not be used to generate confidence intervals.

  5. Got a $75,000 Salary? Here's How Much You Should Be ... - AOL

    www.aol.com/got-75-000-salary-heres-130026245.html

    So let's get back to that $200 a month. If you're 30 now and you contribute that sum to your IRA through age 67, you'll end up with a balance of about $792,000 if your investments grow 10% per year.

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  7. Ratio - Wikipedia

    en.wikipedia.org/wiki/Ratio

    The ratio of width to height of standard-definition television. In mathematics, a ratio (/ ˈ r eɪ ʃ (i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3).

  8. 12 Effective Rules To Get Back Into Shape After a Long Break

    www.aol.com/12-effective-rules-back-shape...

    For example, a calendar habit tracker where you cross off every day you work out or mark every night you get eight hours of sleep." 6. Celebrate your achievements.

  9. 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.