2015年12月24日SAT官方每日一題

2015/12/24 瀏覽次數:1 收藏
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  標題範例:Mathematics > Standard Multiple Choice

  Read the following SAT test question and then click on a button to select your answer.

  When the positive integer n is divided by 5, the remainder is 0. What is the remainder when 3n is divided by 5?

  (A) 0

  (B) 1

  (C) 2

  (D) 3

  (E) 4

  謎底:A

  【剖析】Choice (A) is correct. When the positive integer n is divided by 5, the remainder is 0. It follows that n is a multiple of 5. Therefore, 3n is also a multiple of 5, and so the remainder when 3n is divided by 5 is likewise 0.