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  2. Missing dollar riddle - Wikipedia

    en.wikipedia.org/wiki/Missing_dollar_riddle

    The guests of the hotel paid $27, but also have $3 among their pockets at the story's end. Their assets are $3, and their liabilities are $27 ($30 = 27 + 3). Thus, the original total is accounted for. From the perspective of the hotel clerk, the hotel has $25 in assets and lost $5 in liabilities ($30 = 25 + 5).

  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 brand of cereals contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be ...

  4. Debora L. Spar - Pay Pals - The Huffington Post

    data.huffingtonpost.com/paypals/debora-l-spar

    between 2008 and 2012, better performance than 30% of all directors The Debora L. Spar Stock Index From June 2011 to December 2012, if you bought shares in companies when Debora L. Spar joined the board, and sold them when she left, you would have a -6.3 percent return on your investment, compared to a 12.5 percent return from the S&P 500.

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