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  2. Monty Hall problem - Wikipedia

    en.wikipedia.org/wiki/Monty_Hall_problem

    If the car is behind door 1, the host can open either door 2 or door 3, so the probability that the car is behind door 1 and the host opens door 3 is ⁠ 1 / 3 ⁠ × ⁠ 1 / 2 ⁠ = ⁠ 1 / 6 ⁠. If the car is behind door 2 – with the player having picked door 1 – the host must open door 3, such the probability that the car is behind door ...

  3. 4 3 2 1 (novel) - Wikipedia

    en.wikipedia.org/wiki/4_3_2_1_(novel)

    978-1-62779-446-6. 4 3 2 1 is a 2017 novel by Paul Auster published by Henry Holt and Co. It describes four alternate versions of the life of Archie Ferguson in the 1950s and 1960s, and explores how an individual's life and personality is shaped by chance and circumstance. In September 2017 it was shortlisted for the 2017 Man Booker Prize. [1]

  4. Three prisoners problem - Wikipedia

    en.wikipedia.org/wiki/Three_Prisoners_problem

    It is now clear that if the warden answers B to A (⁠ 1 / 2 ⁠ of all cases), then ⁠ 1 / 3 ⁠ of the time C is pardoned and A will still be executed (case 4), and only ⁠ 1 / 6 ⁠ of the time A is pardoned (case 1). Hence C's chances are (⁠ 1 / 3 ⁠)/(⁠ 1 / 2 ⁠) = ⁠ 2 / 3 ⁠ and A's are (⁠ 1 / 6 ⁠)/(⁠ 1 / 2 ⁠) = ⁠ 1 / ...

  5. Chroma subsampling - Wikipedia

    en.wikipedia.org/wiki/Chroma_subsampling

    The subsampling scheme is commonly expressed as a three-part ratio J:a:b (e.g. 4:2:2) or four parts, if alpha channel is present (e.g. 4:2:2:4), that describe the number of luminance and chrominance samples in a conceptual region that is J pixels wide and 2 pixels high. The parts are (in their respective order):

  6. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    For any integer n, n ≡ 1 (mod 2) if and only if 3n + 14 (mod 6). Equivalently, ⁠ n − 1 / 3 ⁠ ≡ 1 (mod 2) if and only if n ≡ 4 (mod 6). Conjecturally, this inverse relation forms a tree except for the 124 loop (the inverse of the 421 loop of the unaltered function f defined in the Statement of the problem section of ...

  7. 1 + 2 + 3 + 4 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    The partial sums of the series 1 + 2 + 3 + 4 + 5 + 6 + ⋯ are 1, 3, 6, 10, 15, etc.The nth partial sum is given by a simple formula: = = (+). This equation was known ...

  8. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    For example, when d=4, the hash table for two occurrences of d would contain the key-value pair 8 and 4+4, and the one for three occurrences, the key-value pair 2 and (4+4)/4 (strings shown in bold). The task is then reduced to recursively computing these hash tables for increasing n , starting from n=1 and continuing up to e.g. n=4.

  9. Modular arithmetic - Wikipedia

    en.wikipedia.org/wiki/Modular_arithmetic

    Adding 4 hours to 9 o'clock gives 1 o'clock, since 13 is congruent to 1 modulo 12. In mathematics, modular arithmetic is a system of arithmetic for integers, where numbers "wrap around" when reaching a certain value, called the modulus. The modern approach to modular arithmetic was developed by Carl Friedrich Gauss in his book Disquisitiones ...