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:

The truthfulness of the declarations X and Z are indeterminate.

Some plunks are plinks, and since all plinks are plonks, some plunks are plonks (Y).

Edited on April 8, 2021, 1:25 pm

Posted by Dej Mar on 2021-04-08 11:06:52