# SAT Math Multiple Choice Practice Question 554: Answer and Explanation

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**Question: 554**

**11.** If *b* is a positive number not equal to 1, which of the following must also be positive?

A.

B.

C.

D. 2 – *b*

E. 2*b* – 1

**Correct Answer:** A

**Explanation:**

**A** Be sure to read the question carefully; the key here is *must be positive*. Let's try plugging in an easy number for *b*. If you make *b* = 2, then let's see which of the choices is positive. A becomes . B becomes , so you can eliminate it. C becomes . D becomes 0, so you can eliminate it, and E becomes 3. Now let's try making *b* = . In this case, A becomes . C becomes –1, so you eliminate it. E becomes 0; eliminate. That leaves you with A.