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Poby
16 Sep 15 13:48
Joined:
Date Joined: 10 Mar 03
| Topic/replies: 67 | Blogger: Poby's blog
My eldest - 12 had homework on sequences. Most were straightforward, however, this one had me baffled 7, 5, 2, 1.

Anyone help?
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Report mememe • September 16, 2015 2:56 PM BST
It's a mis-print

should read 7,6,5,4,3,2,1
Next number is 0
Happy

seriously, it's not a sequence as differences between numbers show the pattern.
Report dunlaying • September 16, 2015 4:31 PM BST
If you use magic triangles to reduce you get
7 5 2 1
2 3 1
  1 2
   1
which does not seem to work. Are you sure that the question has not been cattled?

7 5 3 1
2 2 2
  0 0   for example works. Not that you would need to use anything other than observation to solve it.
Report laroche • September 16, 2015 4:39 PM BST
7     5     2     1     5 (or -3?)
   2     3     1     4
      1     2     3
Report tobywong. • September 16, 2015 4:44 PM BST
-3
Report dunlaying • September 16, 2015 4:46 PM BST
Very well done Laroche.
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