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Distinct Delivery Deduction (Posted on 2014-09-04) Difficulty: 3 of 5
Art, the mail carrier delivers mail to the 19 houses on the east side of a street.

Art notices that:
(i) No two adjacent houses ever get mail on the same day, and:
(ii) There are never more than two houses in a row that get no mail on the same day.

How many distinct patterns of mail delivery are possible?

No Solution Yet Submitted by K Sengupta    
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Comments: ( Back to comment list | You must be logged in to post comments.)
@ Steve Herman | Comment 6 of 7 |
Please see my revised post.
  Posted by Ady TZIDON on 2014-09-05 04:08:58
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