PS X-Ray
3.1 PS X-Ray
 
3.2 PS FUNDAMENTALS
 
 
3.3 PS Step Method
 
3.4 Practice Problems
 
PS X-Ray
Here is what a typical Problem Solving question looks like:

Directions: The following question has five answer choices. Select the best of the answer choices given.

Which of the following numbers is prime?
(A) 1
(B) 2
(C) 15
(D) 32
(E) 56
Note that the answer choices on the computer screen are preceded by ovals, not letters. We use ovals in the questions in this book to replicate that format, although we stick to letters A through E in the explanations for the sake of clarity.
Nothing fancy here—you’re given a question, then asked to choose the correct answer. You’ll choose the answer by clicking on the oval that precedes the choices you want. If you change your mind, you can de-select an answer by clicking on it again or by simply selecting another answer. If you’re wondering, the correct answer is B, 2. As you may recall from the previous chapter, 1 is not prime because it has only one positive factor, and 15, 32, and 56 all have factors besides 1 and themselves.
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