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

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 5.4).

I'm quite confused how to do this without backtracking...

I'm trying to do this non-programatically only.

Thank you.

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