Six educated frogs change sides so that
the three black ones are to the
left and the white frogs to the right, with the unoccupied tumbler at
the opposite end—No. 7.
They can jump to the next tumbler (if
unoccupied), or over one, or two, frogs to an unoccupied
jumps can be made in either direction, and a frog may jump over his own
or the opposite colour, or both colours.
specimen jumps will make everything quite plain: 4 to 1, 5 to 4, 3 to
5, 6 to 3.
Can you show how they do it in ten jumps?