1 10 8 3 6 5 4 7 2 9
1 10 6 5 2 9 7 4 3 8
1 10 2 9 3 8 6 5 7 4
1 10 7 4 8 3 2 9 5 6

The repeater is 1, and the cycle, 2, 3, 4, 5, 6, 7, 8, 9, 10. We here have 4 groups of 9 lines each.

My solution for 11 persons on 45 occasions is as follows:—

2119476518310
2111763108549
2111039485176
2115813106794
2111103496758

There are two repeaters, 1 and 2, and the cycle is, 3, 4, 5,... 11. We thus get 5 groups of 9 lines each.

The case of 12 persons on 55 occasions is solved thus:—

123124115106978
124116987105123
125108711431269
126910531278114
127812369114510

Here 1 is a repeater, and the cycle is 2, 3, 4, 5,... 12. We thus get 5 groups of 11 lines each.


[274.—THE MOUSE-TRAP PUZZLE.—solution]