Challenge #241: Friday the 13th

[paulfound]

Spoiler

Bonus: I searched 1400 to 3000 NO years didn't have a Friday 13th

[WernerE]

Nice and short this week, thanks.

[JasonHu]

Spoiler

Here is my submission!

[DarekS]

solved!

[jamielaird]

Here's my solution:

Spoiler

[SeanAdams]

I did it slightly differently to others and checked to see if there were any gap years.

Spoiler

The top summary only counts the in-scope; the bottom counts all years so this way the join will take care of any missing years (of which there were NONE)

[p-g]

My solution!!!

Spoiler

I used Append tool to generate all dates from 1900 to 2020. It was pretty straightforward from this point forward. Answer to Bonus question - No. Every year has at least 1 or at most 3 Friday the 13th in each calendar year.

 

[kmedici]

Solution attached

[randreag]

here my solution

[hanykowska]

a very pleasant challenge

some findings in the spoiler:

Spoiler

there have been 209 Friday the 13th since 1900-01-01
and on average, there's 1.7 of those every year
there has not been a year without a Friday the 13th

my workflow (without additional questions from the spoiler above):

Spoiler