# SAT Math Multiple Choice Practice Question 361: Answer and Explanation

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**Question: 361**

**9.** If *l, m*, and *n* are positive integers greater than 1, , and , then which of the following must be true?

A.

B.

C.

D.

E.

**Correct Answer:** A

**Explanation:**

**A** If and both land mare integers, then *m* must be either 1, 3, 7, or 21. If , however, then *m* must also be a factor of 39, so it must be 3. Therefore, and , so .