ISEE Mathematics Achievement Question 5: Answer and Explanation
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Question: 5
5. If x is an even integer, then which of the following CANNOT be an integer?
- A. x – 2
- B. 2x + 3
- C.
- D.
Correct Answer: C
Explanation:
C
Choice (C) cannot be an integer because an even integer times any integer is even and that result plus an odd integer is odd. An odd number divided by 2 is not an integer.
Plug in an acceptable value for x, such as x = 4. Only choice (C) yields a non-integer when you test in 4.