Survo puzzles: www.survo.fi/puzzles
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Copyright (c) Survo Systems 2006-2007
Survo puzzle 75/2007 (60)
A B C D E F
1 * * * * 16 17 54
2 * * * * 15 * 70
3 8 7 12 14 * * 78
4 11 9 13 * * * 98
22 24 39 61 73 81
Survo puzzle 76/2007 (680)
A B C D E F
1 * * * 11 * * 54
2 * * 8 * * 21 70
3 * 9 * * 24 * 78
4 16 * * 23 * 22 98
22 24 39 61 73 81
Survo puzzle 77/2007 (?)
A B C D E F
1 * * * * * * 54
2 * * * * * * 70
3 * * * * * * 78
4 * * * * * * 98
22 24 39 61 73 81
This problem has several solutions since the marginal sums are
exactly the same as those in two previous problems (75 and 76/2007).
The task is to find all solutions of this Survo puzzle.
It is required to give just the number of different solutions.
The task is practically impossible without making a computer
program made for solving Survo puzzles.
A prize of 100 euros is drawn at random for one of the people sending
the right answer on 13th October 2007 at the latest.