Question

Show that, without backtracking, 155 nodes must be checked before the first solution to the n = 4 instance of the n-Queens problem is found (in contrast to the 27 nodes in Figure 1).Use mathmetical proof.


 

1,2 2.3 2.4 2, 1 2, 2 2,3 2,4 2, 2 3, 1 4,14,2)(4,3)4,4 4,14,2) 4, 3

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fist saludion 2 Se X Au: X 1- f0C1) aN0 pesile Ases as o bauk roadking 1 x4x4x4 is implumnte 64 modts 3 2800 C1,2) S 1 (4 x 3tpae ( 1) ! (12 3+1) -t (16+ 9 1 (th 115 modas 3mody

At last of the first image it is written 155 nodes(in case it is not clear).

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