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Re: Only one Friday 13th coming in 2016
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From: |
Greg Wooledge |
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Subject: |
Re: Only one Friday 13th coming in 2016 |
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Date: |
Mon, 21 Dec 2015 10:13:38 -0500 |
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User-agent: |
Mutt/1.4.2.3i |
On Mon, Dec 21, 2015 at 02:59:20PM +0000, Allodoxaphobia wrote:
> Is the logic exhaustive ? -- in that it shows there
> are no years with *no* Friday The 13Th's?
The Gregorian calendar has 14 different year layouts: 7 non-leap-years
beginning with Sunday through Saturday, and 7 leap-years beginning with
Sunday through Saturday.
To prove your assertion, it is sufficient to count the number of Friday
the 13ths in each of those 14 layouts.