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These problems deal with sequences of numbers. Can you spot what the sequences' rules are?
Begin with a finite sequence of blocks in a row, each in one of 3 colors: red, blue, yellow.

Below each pair of neighboring blocks place a new block with the color rule: If the blocks are the same color use that color but if they are different use the third color.

Example:

r b y y b
 y r y r
  b b b
   b b
    b
How can the color of the last block be easily predicted from the top row?

Note: I don't know the full answer but can solve special cases.

(No Solution Yet, 4 Comments) Submitted on 2018-12-14 by Jer   
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