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This eBook from the Gutenberg Project consists of approximately 205 pages of information about The Mental Life of Monkeys and Apes.

PROBLEM 2.  Second from right end

                   Doors No. of No. of
Settings open doors open right door
 1..................5.6.7.8....................4.......
...........7
 2..................2.3.4.5.6..................5.......
...........5
 3..................1.2.3.4.5.6.7.8.9..........9.......
...........8
 4..................5.6.7......................3.......
...........6
 5..................1.2.3.4....................4.......
...........3
 6..................4.5.6......................3.......
...........5
 7..................2.3.4.5....................4.......
...........4
 8..................1.2.3......................3.......
...........2
 9..................1.2.3.4.5.6.7..............7.......
...........6
10..................2.3.4.5.6.7.8.9............8............
......8

PROBLEM 3.  Alternate left and right ends

                   Doors No. of No. of
Settings open doors open right door
 1..................5.6........................2.......
...........5
 2..................5.6........................2.......
...........6
 3..................4.5.6.7.8.9................6.......
...........4
 4..................4.5.6.7.8.9................6.......
...........9
 5..................1.2.3.4.5..................5.......
...........1
 6..................1.2.3.4.5..................5.......
...........5
 7..................2.3.4.5.6.7................6.......
...........2
 8..................2.3.4.5.6.7................6.......
...........7
 9..................3.4.5.6.7.8................6.......
...........3
10..................3.4.5.6.7.8................6............
......8

PROBLEM 4.  Middle

                   Doors No. of No. of
Settings open doors open right door
 1..................4.5.6.7.8..................5.......
...........6
 2..................1.2.3......................3.......
...........2
 3..................1.2.3.4.5.6.7.8.9..........9.......
...........5
 4..................2.3.4.5.6..................5.......
...........4
 5..................6.7.8......................3.......
...........7
 6..................3.4.5.6.7.8.9..............7.......
...........6
 7..................7.8.9......................3.......
...........8
 8..................1.2.3.4.5.6.7..............7.......
...........4
 9..................2.3.4......................3.......
...........3
10..................3.4.5.6.7..................5............
......5

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