SAT Math Multiple Choice Practice Question 432: Answer and Explanation

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Question: 432

15. If a2b = 122, 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 a2b = 122, 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: a2 × 1 = 122 = 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.

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