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  2. Product (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Product_(mathematics)

    In mathematics, a product is the result of multiplication, or an expression that identifies objects (numbers or variables) to be multiplied, called factors.For example, 21 is the product of 3 and 7 (the result of multiplication), and (+) is the product of and (+) (indicating that the two factors should be multiplied together).

  3. Methods of computing square roots - Wikipedia

    en.wikipedia.org/wiki/Methods_of_computing...

    A method analogous to piece-wise linear approximation but using only arithmetic instead of algebraic equations, uses the multiplication tables in reverse: the square root of a number between 1 and 100 is between 1 and 10, so if we know 25 is a perfect square (5 × 5), and 36 is a perfect square (6 × 6), then the square root of a number greater than or equal to 25 but less than 36, begins with ...

  4. Orders of magnitude (numbers) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(numbers)

    1/52! chance of a specific shuffle Mathematics: The chances of shuffling a standard 52-card deck in any specific order is around 1.24 × 10 −68 (or exactly 1 ⁄ 52!) [4] Computing: The number 1.4 × 10 −45 is approximately equal to the smallest positive non-zero value that can be represented by a single-precision IEEE floating-point value.

  5. 1 − 2 + 3 − 4 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%E2%88%92_2_%2B_3_%E2%88...

    The idea becomes clearer by considering the general series 1 − 2x + 3x 2 − 4x 3 + 5x 4 − 6x 5 + &c. that arises while expanding the expression 1 ⁄ (1+x) 2, which this series is indeed equal to after we set x = 1.

  6. Chi-squared distribution - Wikipedia

    en.wikipedia.org/wiki/Chi-squared_distribution

    An additional reason that the chi-squared distribution is widely used is that it turns up as the large sample distribution of generalized likelihood ratio tests (LRT). [8] LRTs have several desirable properties; in particular, simple LRTs commonly provide the highest power to reject the null hypothesis ( Neyman–Pearson lemma ) and this leads ...

  7. List of sovereign states by sex ratio - Wikipedia

    en.wikipedia.org/wiki/List_of_sovereign_states...

    A ratio above 1, for example 1.1, means there are more males than females (1.1 males for every female). A ratio below 1, for example 0.8, means there are more females than males (0.8 males for every female). A ratio of 1 means there are equal numbers of males and females.

  8. List of radioactive nuclides by half-life - Wikipedia

    en.wikipedia.org/wiki/List_of_radioactive...

    4.8 californium-255: 1.417 5.10 lead-199: 1.50 5.4 radium-230: 1.55 5.6 mendelevium-259: 1.60 5.8 americium-238: 1.63 5.9 astatine-208: 1.63 5.9 polonium-205: 1.66 6.0 einsteinium-249: 1.703 6.13 bismuth-202: 1.72 6.2 astatine-207: 1.80 6.5 bismuth-201: 1.80 6.5 protactinium-239: 1.8 6.5 fluorine-18: 1.8295 6.586 americium-245: 2.05 7.4 ...

  9. Microsoft Windows - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Windows

    Windows is a product line of proprietary graphical operating systems developed and marketed by Microsoft.It is grouped into families and subfamilies that cater to particular sectors of the computing industry – Windows (unqualified) for a consumer or corporate workstation, Windows Server for a server and Windows IoT for an embedded system.