# SAT Math Multiple Choice Practice Question 432: Answer and Explanation

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**Question: 432**

**15.** If *a*^{2}*b* = 12^{2}, and *b* is an odd integer, then *a* could be divisible by all of the following EXCEPT

A. 3

B. 4

C. 6

D. 9

E. 12

**Correct Answer:** D

**Explanation:**

**D** Note first that this is an EXCEPT question. Now, since *a*^{2}*b* = 12^{2}, and *b* is an odd integer, let's see what you can come up with. Let's make *b* equal 1, so you get the following: *a*^{2} × 1 = 12^{2} = 144, so *a* = 12. If *a* equals 12, it is divisible by 1, 2, 3, 4, 6, and 12. The only choice that remains is D.