Three kinds of apples are mixed in a box.
How many apples must you take to be sure of:
A) At least 2 apples of one kind?
B) At least 3 apples of one kind?
Explanations
A) 4 apples
B) 7 apples
[After Boris A. Kordemsky. The Moscow Puzzles: 359 mathematical recreations. 1972]