Question 3
A beaver has alien friends shown in two groups: those who eat only fish (left) and those who eat only leaves (right).
Last week it ate with the groups shown for Days 1–4, left to right. It must eat fish when none of its companions eats leaves.
On how many of those four days must the beaver eat fish?
Last week it ate with the groups shown for Days 1–4, left to right. It must eat fish when none of its companions eats leaves.
On how many of those four days must the beaver eat fish?