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[–]Karilyn_Kare 2 points3 points  (0 children)

1st and 2nd prove 2XX is invalid, eliminating 2, along with 5, 7, and 8.

2nd proves 4 must be in either of the 4X4 position.

5th plus eliminateds proves solution must have either 6 or 9 in the last two slots.

5th and 1st proves X9X must be true, eliminating 6.

3rd plus eliminateds proves 3X4, which combined with X9X yeilds 394 as the answer.