Last Problem:
What do the red letters have in common?
What do the black letters have in common?
ACTBYK
MDUEW
Answer:
The red letters are the capital letters in the alphabet that have only vertical symmetry. The black letters are the capitals that have only horizontal symmetry.
Today’s Challenge:
Two players take turns placing identical coins on a perfectly round table. The first player who cannot put a coin on the table without overlapping an existing coin loses.
Devise a strategy so that one of the players will always win, no matter how large the table is.