a problem that cannot be easily solved
1. Plant ten trees in five rows of four trees each.
2. Cut a cake into eight equal pieces with only three cuts.
3. If today was tomorrow yesterday, what would today be the
day after tomorrow?
4. The prisoner is in a cell where one door leads to freedom
and the other door leads to death. There are two guards.
One guard always tells the truth. The other guard always
tells lies. The prisoner does not know which door is
which or which guard is which or which guard is on which
door. He is allowed to ask one question of one guard in
order to find out the door to freedom. What question must
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