Readership - Futility Closet

Readership

Assume that these statements are true:

Not all Futility Closet readers are U.S. residents.
All walrus veterinarians who are not U.S. residents are not Futility Closet readers.

Do 1 and 2 imply that

	Select Click for Answer
Yes. Statement 1 says that there are Futility Closet readers who are not U.S. residents. Let A be one of them. We’re claiming that A is not a walrus veterinarian, which would imply that statement 3 is true. Suppose the contrary, that A is a walrus veterinarian. Since he’s not a U.S. resident, statement 2 implies that he’s not a Futility Closet reader, which isn’t true. Adapted from Svetoslav Savchev, Mathematical Miniatures, 2003.