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  2. Monty Hall problem - Wikipedia

    en.wikipedia.org/wiki/Monty_Hall_problem

    The game host then opens one of the other doors, say 3, to reveal a goat and offers to let the player switch from door 1 to door 2. The Monty Hall problem is a brain teaser, in the form of a probability puzzle, based nominally on the American television game show Let's Make a Deal and named after its original host, Monty Hall.

  3. Missing dollar riddle - Wikipedia

    en.wikipedia.org/wiki/Missing_dollar_riddle

    9) 27 + 2 ≠ 25 10) 29 ≠ 25. How it should be: 7) 9 + 9 + 9 = 25 + 2 8) 9 + 9 + 9 -2 = 25 + 2 -2 (adding -2 to both sides of the equation to cancel the +2 on the right side, which means the bellhop returned the tip or gave a discount of $2) 9) 9 + 9 + 9 - 2 = 25 10) 27 - 2 = 25 11) 25 = 25. The puzzle should subtract the bellhop's tip from ...

  4. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    However the titles of bonds issued by governments and other issuers use the fractional form, e.g. "3 + 1 ⁄ 2 % Unsecured Loan Stock 2032 Series 2". (When interest rates are very low, the number 0 is included if the interest rate is less than 1%, e.g. "0 + 3 ⁄ 4 % Treasury Stock", not "3 ⁄ 4 % Treasury Stock".) It is also widely accepted ...

  5. Irreducible fraction - Wikipedia

    en.wikipedia.org/wiki/Irreducible_fraction

    In the second step, they were divided by 3. The final result, ⁠ 4 / 3 ⁠, is an irreducible fraction because 4 and 3 have no common factors other than 1. The original fraction could have also been reduced in a single step by using the greatest common divisor of 90 and 120, which is 30. As 120 ÷ 30 = 4, and 90 ÷ 30 = 3, one gets

  6. Power of two - Wikipedia

    en.wikipedia.org/wiki/Power_of_two

    The first 3 powers of 2 with all but last digit odd is 2 4 = 16, 2 5 = 32 and 2 9 = 512. The next such power of 2 of form 2 n should have n of at least 6 digits. The only powers of 2 with all digits distinct are 2 0 = 1 to 2 15 = 32 768, 2 20 = 1 048 576 and 2 29 = 536 870 912.

  7. Travelling salesman problem - Wikipedia

    en.wikipedia.org/wiki/Travelling_salesman_problem

    Solution of a travelling salesman problem: the black line shows the shortest possible loop that connects every red dot. In the theory of computational complexity, the travelling salesman problem (TSP) asks the following question: "Given a list of cities and the distances between each pair of cities, what is the shortest possible route that visits each city exactly once and returns to the ...

  8. Transportation safety in the United States - Wikipedia

    en.wikipedia.org/wiki/Transportation_safety_in...

    As the amount of speeding increases, the degree of overrepresentation increases; however, even at 5–9 miles over the limit, drivers were overrepresented in fault by a factor of over 2.0. ». «drinking drivers were between 3.5 and 18 times as likely to be at fault in the crash, depending on the amount of alcohol ingested.

  9. Long Peace - Wikipedia

    en.wikipedia.org/wiki/Nuclear_peace

    Tallies from the 1960s report military spending rates above 6% of world GDP and in a range from 3.8% to 4.5% in the 1970s and 1980s. [42] It was 4.92% in 1990 (below the Cold War average), [43] reached the lowest recorded in modern history mark [44] of 2.1% in 2014 [45] and 2018, [46] [47] and fluctuates between 2.1 and 2.4% ever since.