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  2. 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.

  3. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    Decimal fractions can also be expressed using scientific notation with negative exponents, such as 6.023 × 107, which represents 0.0000006023. The 107 represents a denominator of 10 7. Dividing by 10 7 moves the decimal point 7 places to the left. Decimal fractions with infinitely many digits to the right of the decimal separator ...

  4. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    Perhaps the most notable hypergeometric inversions are the following two examples, involving the Ramanujan tau function and the Fourier coefficients of the J-invariant (OEIS: A000521): ∑ n = − 1 ∞ j n q n = 256 ( 1 − z + z 2 ) 3 z 2 ( 1 − z ) 2 , {\displaystyle \sum _{n=-1}^{\infty }\mathrm {j} _{n}q^{n}=256{\dfrac {(1-z+z^{2})^{3}}{z ...

  5. Electrical resistivity and conductivity - Wikipedia

    en.wikipedia.org/wiki/Electrical_resistivity_and...

    For example, the coefficient becomes lower at higher temperatures for copper, and the value 0.00427 is commonly specified at 0 °C. [ 53 ] The extremely low resistivity (high conductivity) of silver is characteristic of metals.

  6. Sources of electrical energy - Wikipedia

    en.wikipedia.org/wiki/Sources_of_electrical_energy

    The electric field sends the electron to the p-type material, and the hole to the n-type material. If an external current path is provided, electrical energy will be available to do work. The electron flow provides the current, and the cell's electric field creates the voltage. With both current and voltage the silicon cell has power.

  7. Orders of magnitude (power) - Wikipedia

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

    1.00 × 10 4 W eco: average power consumption per person in the United States in 2008 (87,216 kWh/year) 1.4 × 10 4 W tech: average power consumption of an electric car on EPA's Highway test schedule [25] [26] 1.45 × 10 4 W astro: power per square metre received from the Sun at Mercury's orbit at perihelion: 1.6–3.2 × 10 4 W

  8. Teen with E. coli is battling kidney failure after eating ...

    www.aol.com/teen-e-coli-battling-kidney...

    The Summary. A high school freshman in Colorado has been hospitalized with a rare and dangerous complication of E. coli poisoning. Kamberlyn Bowler, 15, said she ate McDonald's Quarter ...

  9. Electrical energy - Wikipedia

    en.wikipedia.org/wiki/Electrical_energy

    Electric utilities measure energy using an electricity meter, which keeps a running total of the electric energy delivered to a customer. Electric heating is an example of converting electrical energy into another form of energy, heat. The simplest and most common type of electric heater uses electrical resistance to convert the energy. There ...