Given the categorical proposition "All biologists are scientists." If both the quality and the quantity are changed, the resulting proposition is:
A) Some scientists are not biologists.
B) Some biologists are not scientists.
C) No biologists are scientists.
D) Some biologists are scientists.
E) All biologists are not scientists.

Question

Quizplus · Accepted Answer

If we change the quality from universal affirmative (All) to particular affirmative (Some), the proposition becomes "Some biologists are scientists." 
If we also change the quantity from universal (All) to particular (Some), the proposition becomes "Some biologists are not scientists," which is option B.

Given the Categorical Proposition "All Biologists Are Scientists