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3 votes
3 votes

Consider a 3-puzzle where, like in the usual 8-puzzle game, a tile can only move to an adjacent empty space. Given the initial state 

1 2
  3

which of the following state cannot be reached?

A 3 1
  2
B   3
2 1
C 1 3
  2
D   2
1 3
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2 Answers

3 votes
3 votes
It will move clock wise or anticlockwise.
So ans should be C.
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