LSAT Practice Test

What does the term "Must" signify in Formal Logic?

1. An evidence keyword

2. Conclusion

3. Necessity

4. Sufficient condition

The correct answer is: Necessity

In formal logic, the term "Must" signifies necessity. When a statement includes the term "Must," it is indicating that something is required or unavoidable. In logical reasoning, this term is often used to establish a necessary condition for an argument or conclusion to be valid. This contrasts with a sufficient condition, which would guarantee a particular outcome. Therefore, in formal logic, "Must" indicates a necessary condition that must be met for the argument to hold true.