標題範例:Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
If P is an odd integer, which of the following is an even integer?
(A)p-2
(B)p²
(C)p²-2
(D)(p-2)²
(E) p²-p
謎底:E
【剖析】If p is an odd integer, then p-2 and p² are odd integers. Similarly, choices (C) and (D) are odd integers. Since an odd integer subtracted from another odd integer is always an even integer, p²-p is even.