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:
We know that some plunks are plinks. Since all plinks are plonks, those plunks must also be plonks. Then, some plonks are plunks. Therefore, Y is true.
Posted by Math Man
on 2021-04-08 13:47:53