If all plinks are plonks and some plunks are plinks, which of these statements must be true?
X: All plinks are plunks.
Y: Some plonks are plunks.
Z: Some plinks are not plunks.
Source: Crux Mathematicorum, 2004:
(In reply to Cacophony
by Dej Mar)
"It is given that all plinks are plonks, yet
it is not given whether none, some, or all plonks are plinks."
Assuming at least one plink exists, it would not be possible for none of the plonks to be plinks. At least one of them must be.
Posted by tomarken
on 2021-04-08 13:14:04