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Block Positions (Posted on 2013-08-19) Difficulty: 3 of 5
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | C | D |  | I | H |  | E | G |  | F | B |  | E | I |  
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | B | H |  | A | G |  | J | C |  | D | F |  | A | J |
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+  
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | A | E |  | B | G |  | H | J |  | H | E |  | C | B |  
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | I | G |  | C | F |  | F | I |  | A | D |  | D | J |
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | G | I |  | F | D |  | B | E |  | H | J |  | H | F |  
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | A | D |  | B | E |  | C | G |  | J | I |  | A | C |
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | E | F |  | I | J |  | B | A |  | C | G |  | D | E |  
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | F | H |  | J | H |  | A | D |  | G | C |  | I | B |
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | J | B |  | C | D |  | F | D |  | B | A |  | H | G |  
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+ 
  | C | J |  | E | A |  | H | I |  | I | E |  | G | F |
  +---+---+  +---+---+  +---+---+  +---+---+  +---+---+
Each of the 25 blocks of four letters shown above can be rotated about its center, either 90o clockwise, 90o anti-clockwise or 180o. When all the blocks are in their correct orientations, all the ten rows and columns contain the letters A to J exactly once.

Sixteen of the blocks shown above are not in their correct orientations. Which 16 out of the 25 blocks have been rotated and in which direction(s)?

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
Solutioncomputer solutionCharlie2013-08-19 19:34:12
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