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A non-trivial progression (Posted on 2015-11-17) Difficulty: 2 of 5
November 13, 2015, when expressed in MM/DD/YY format, is 11/13/15. The MM, DD and YY terms, in that order, form an arithmetic progression. It is non-trivial because the three numbers are different.

The first such date in any given century is 01/02/03. What is the last non-trivial arithmetic progression in the century?

What is the last non-trivial geometric progression in the century?

See The Solution Submitted by Steve Herman    
Rating: 4.6667 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Hints/Tips d3 answers? | Comment 4 of 7 |
Not so fast with the handing out of the hats.  The problem is not yet solved 100% correctly.

(Have you noticed that d1, d2, d3 is a progression?) 

  Posted by Steve Herman on 2015-11-17 16:13:37
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