LSAT 105 | Section 1 | Logical Reasoning: Q12

LR Question 12 Explanation

QUESTION TEXT: Alice will volunteer to work on the hospital fund-raising …

QUESTION TYPE: Parallel Reasoning

ANALYSIS: Let’s break down the structure of the stimulus.

Alice will volunteer only if:

1. Bruce volunteers, AND
2. A majority of others promise to select Bruce as a manager.
3. Bruce volunteers, but none of them promise to select him as manager.

Therefore, Alice will not volunteer. You want to look for an answer where X will happen only if A and B both happen. A happens, but not B. So X will not happen.

___________

1. There is only one condition that has to be met here (Bill has enough time), not two like the stimulus. Also, the conclusion is not certain, just likely, whereas the conclusion in the stimulus is certain.
2. This is a flawed argument. Leon will only go if Vera goes, but because Leon is not going, Vera must not be going either. This makes no sense. The argument in the stimulus is actually logical.
3. CORRECT. This matches exactly. X (Jim attending) will only happen if A (Sam going) and B (Elaine going) also happen. A happens, but not B. So X will not happen.
4. This involves conditional relationships between multiple people and different if-then chains. This is way more complex than the stimulus and doesn’t match.
5. Here, A is true, but B is uncertain. So the argument concludes that if B happens, X will happen. But in the stimulus B doesn’t happen so X can’t happen either.