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  2. Unit fraction - Wikipedia

    en.wikipedia.org/wiki/Unit_fraction

    Slices of approximately 1/8 of a pizza. A unit fraction is a positive fraction with one as its numerator, 1/ n.It is the multiplicative inverse (reciprocal) of the denominator of the fraction, which must be a positive natural number.

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

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

    3.5 bismuth-201m1: 59.1 3.55 hours 10 3 seconds dubnium-270: 1.0 3.6 bismuth-212: 1.0092 3.633 neptunium-240: 1.032 3.72 actinium-229: 1.045 3.76 curium-249: 1.0692 3.849 lead-204m2: 1.12 4.0 gallium-68: 1.1285 4.063 americium-237: 1.22 4.4 mendelevium-256: 1.283 4.62 rutherfordium-267: 1.3 4.7 dubnium-266: 1.33 4.8 californium-255: 1.417 5.10 ...

  4. List of countries by median age - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    The median age is the index that divides the entire population into two numerically equal age groups, one younger than that age and the other older than that age ...

  5. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    For example, in base 2 (the binary numeral system) 0.111... equals 1, and in base 3 (the ternary numeral system) 0.222... equals 1. In general, any terminating base expression has a counterpart with repeated trailing digits equal to − 1. Textbooks of real analysis are likely to skip the example of 0.999... and present one or both of these ...

  6. List of countries by income inequality - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    1.40 2022 3.110 2021 4.0 2021 Haiti: Caribbean: Lower middle income 52.41% 2022 2.10 2012 0.765 2012 Hungary: Eastern Europe: High income 33.50% 2022 1.83 2022 3.518 2021 3.1 2021 Indonesia: South-eastern Asia: Upper middle income 41.24% 2022 2.80 2022 3.328 2023 India: Southern Asia: Lower middle income 57.13% 2022 2.90

  7. List of countries by age at first marriage - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_age...

    3.1 1.13 2013 [2] Europe. Average age at first marriage. Darker is younger. Country Men Women Average Age gap Age ratio Year Source

  8. Partial pressure - Wikipedia

    en.wikipedia.org/wiki/Partial_pressure

    The atmospheric pressure is roughly equal to the sum of partial pressures of constituent gases – oxygen, nitrogen, argon, water vapor, carbon dioxide, etc.. In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas as if it alone occupied the entire volume of the original mixture at the same temperature. [1]

  9. List of countries by GDP sector composition - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_GDP...

    1.3 Nominal GDP sector composition (2005 constant prices) 2 GDP from natural resources. 3 List by alphabetical order. 4 GDP (PPP) per person employed by sector.