Question 3
A truck delivers apples from a warehouse to three stores.
Its signal panel tells it where to go: star
means store 1; crescent
means store 2; triangle
means store 3. Several signals may appear together. Store 1 has highest priority; stores 2 and 3 have equal priority. After a delivery and return to the warehouse, all signals disappear. One afternoon the truck goes to store 1, then store 2, then store 1 again. Which set of three received signal boards is possible?
Its signal panel tells it where to go: star
means store 1; crescent
means store 2; triangle
means store 3. Several signals may appear together. Store 1 has highest priority; stores 2 and 3 have equal priority. After a delivery and return to the warehouse, all signals disappear. One afternoon the truck goes to store 1, then store 2, then store 1 again. Which set of three received signal boards is possible?
