**PrepTest 78, Game 1, Question 4**

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Summary

The analysis of PT 78 Game 1, Question 4, reveals a strategic approach to solving a local question by incorporating new information and applying logical deductions based on the given rules.

- A new piece of information specifies that T is not a project member, prompting the need for a new local diagram.
- The exclusion of T, based on the rules, necessitates the exclusion of S as well, due to their interconnected conditions.
- Exploration of possibilities based on the remaining rules helps identify that at least one of Q or R must be excluded.
- Analyzing the implications of including or excluding W leads to the conclusion that X must always be included, making answer choice E correct.
- Process of elimination further validates that X is the only option that must be included, as excluding it leads to a contradiction.

Chapters

00:00

Introduction to Local Diagrams

00:22

Rule Application and Deductions

00:37

Strategic Exploration of Possibilities

03:01

Determining the Necessary Project Member