A research team is designing a new experiment using four materials: Material P, Material Q, Material R, and Material S. The following conditions apply: * Material P can only be used if Material Q is present. * Material R cannot be used with Material Q. * Material S must be used if Material P is not used. Which of the following statements *must* be true? **I.** Material P and Material R cannot be used together. **II.** If Material Q is not used, Material S must be used. **III.** Material P and Material S can never be used together.

Question 4 - Quantitative Reasoning Practice Test for the CLT

A research team is designing a new experiment using four materials: Material P, Material Q, Material R, and Material S.

The following conditions apply:

Material P can only be used if Material Q is present.
Material R cannot be used with Material Q.
Material S must be used if Material P is not used.

Which of the following statements must be true?

I. Material P and Material R cannot be used together.
II. If Material Q is not used, Material S must be used.
III. Material P and Material S can never be used together.

I and II
II
I
II and III

Hint

Beware of descriptive words in questions, such as must, always, and could. If a situation must be or is always true, it must do so in all cases, as described in the question. Otherwise, it only could be true.

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