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 A non-trivial progression (Posted on 2015-11-17)
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)

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 answers revisited | Comment 5 of 7 |

Not so fast... we'll slow down!

ok, there was no year 00 AD   so   2000 still belongs to 20th century:

12/06/00      is the last   ar. seq.               d=-6

08/28/98    is the last   geo. seq.                q=7/2

Meglio  tardi  che mai,

 Posted by Ady TZIDON on 2015-11-17 18:52:49

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