- 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.
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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
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.
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.
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