LSAT Practice Test

When "All" is negated in formal logic, what does it represent?

1. A. Some

2. B. Most

3. C. Not all

4. D. All and none

The correct answer is: C. Not all

In formal logic, when "All" is negated, it represents "Not all." This is because negating "All" means there are some cases that do not fall under the original "All" category. Option A (Some) does not accurately capture the negation of "All" as it still leaves room for some instances to be included. Option B (Most) is not equivalent to the negation of "All" as it suggests a majority rather than specifically excluding all. Option D (All and none) is not correct because it combines two opposing concepts and does not effectively capture the negation of "All." Therefore, the correct answer is option C (Not all) as it correctly represents the negation of the term "All" in formal logic.