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      • B) How many sum-days are there in the 21st century? Answer A) The last sum-day of the 21st century is December 31, 2043, because 12+31=43, and both the month and day are as big as possible.
      www.braingle.com/brainteasers/32809/sum-day-soon.html
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  2. A) What is the last sum-day of the 21st century? B) How many ...

    specialties.bayt.com › en › specialties

    Oct 01, 2014 · A) The last sum-day of the21st century is December31,2043, because12+31=43, and both the month and day are as big as possible. B) The correct answer is365 Upvote (0) Downvote (0) Reply (0)

  3. Braingle » 'Sum-day Soon' Brain Teaser

    www.braingle.com › brainteasers › 32809

    Answer. A) The last sum-day of the 21st century is December 31, 2043, because 12+31=43, and both the month and day are as big as possible. B) This one is much easier than you might think. The correct answer is 365, because every day in a standard (non-leap) year is part of a sum-day for some year. For example, November 26 is a sum-day for the ...

  4. Nov 13, 2015 · Today, Friday, November 13, 2015 expressed as 11/13/15 is a sequential calendar date consisting of three consecutive odd numbers. 11/13/15 is the last one of its kind to occur in the 21st century...

  5. Timeline of the 21st century - Wikipedia

    en.wikipedia.org › wiki › Timeline_of_the_21st_century
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  6. Palindrome Dates in the 21st Century | Live Science

    www.livescience.com › 33583-palindrome-dates-21st

    Nov 02, 2011 · There are a total of 38 palidrome dates in the 21st Century, in the month/day/year date format, as calculated by Aziz Inan, an electrical engineering professor at the University of Portland ...

  7. After 12/13/14, What Are the Next Fun Dates for Math Lovers ...

    www.smithsonianmag.com › science-nature › last

    Dec 11, 2014 · For those of us in the United States, December 13 is auspicious because it will be the last sequential date of the 21st century: 12/13/14. The next such numerical alignment won't roll around for...

  8. When Did the 21st Century Start? - Time and Date

    www.timeanddate.com › counters › mil2000

    The 21st Century Started in 2001. In 1999, the world was preparing for the New Year's party of a lifetime. The year number in the Gregorian calendar was about to tick over to 2000, supposedly ushering in not only the 21st century but also the 3rd millennium CE. However, the party was held one year too early—it should have been on January 1, 2001.

  9. Major Events in American History in the 21st Century

    www.historycentral.com › Today › 21st

    The major events in American history in the 21st century. Starting from the purchase of Time Warner by AOL and going to the latest events; including COVID-19 and its impact on the US

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