Flash exercise
contributed by
Matt Schiller and Dr. Brad
Hokanson, Interactive Media (DHA 4384) School of
Design, University of Minnesota.
After you have complete the basic exercise
above, here is another strategy to consider. The possibilities (in green)
for nines in the fourth row are in the last two
cells
7
9
2
4
5
6
2
9
4
1 6 7
3
2
8
1 6
5
1 6 7 9
1 6 7 9
9
.
9
.
9
.
9
.
9
.
9
.
9
Because you must have a nine in the fourth row
in the shaded box, you cannot have a nine in the other rows of that
shaded box (the red nines).
Another strategy: What can you guess about the middle rows of the
two shaded boxes? Again, the possibilities for the middle row of the
middle box are in green:
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