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  2. 1 + 1 + 1 + 1 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_1_%2B_1_%2B_1_%2B_%E...

    For some other divergent geometric series, including Grandi's series with ratio −1, and the series 1 + 2 + 4 + 8 + ⋯ with ratio 2, one can use the general solution for the sum of a geometric series with base 1 and ratio ⁠ ⁠, obtaining ⁠ ⁠, but this summation method fails for 1 + 1 + 1 + 1 + ⋯, producing a division by zero.

  3. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    A calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day, and thus consists of a whole number of days. To reconcile the calendar year with the astronomical cycle (which has a fractional number of days) certain years contain extra days ("leap days" or "intercalary days").

  4. History of United States postage rates - Wikipedia

    en.wikipedia.org/wiki/History_of_United_States...

    Initial United States postage rates were set by Congress as part of the Postal Service Act signed into law by President George Washington on February 20, 1792. The postal rate varied according to "distance zone", the distance a letter was to be carried from the post office where it entered the mail to its final destination.

  5. List of Formula One World Drivers' Champions - Wikipedia

    en.wikipedia.org/wiki/List_of_Formula_One_World...

    Schumacher holds the record of earning the championship with most Grands Prix left to run in a season with six when he won the 2002 title at that year's French Grand Prix. [18] Due to the points system , on two occasions ( John Surtees in the 1964 season and Ayrton Senna in the 1988 season) a world champion scored fewer points overall than a ...

  6. Free shipping - Wikipedia

    en.wikipedia.org/wiki/Free_shipping

    Based on ComScore data 65% of eCommerce transactions in Q4 2017 in the United States were with free shipping. This figure has been consistent for the last few years (ranging between 58% and 69%). Moreover, US respondents asked in the survey listed free shipping (54% mentions) as a most important factor for online shipping.

  7. List of Billboard Year-End number-one singles and albums

    en.wikipedia.org/wiki/List_of_Billboard_Year-End...

    The Billboard Year-End chart is a chart published by Billboard which denotes the top song of each year as determined by the publication's charts. Since 1946, Year-End charts have existed for the top songs in pop, R&B, and country, with additional album charts for each genre debuting in 1956, 1966, and 1965, respectively.

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