SAT I 一日一问:2014年6月19日

所属专题:出国留学  来源:CollegeBoard    要点:SAT官方题目  
编辑点评: SAT出题者Collegeboard每天在其官方网站上贴出一道SAT I考试的问题,供考生练习。让我们来看一下你是否有能力回答对这些SAT的问题呢?一起来试试吧~

Mathematics > Standard Multiple Choice

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

function f of (2 n) = 2 function f of n for all integers n

function f of 4 = 4

If function f is a function defined for all positive integers n, and function f satisfies the two conditions above, which of the following could be the definition of function f?

(A) function f of n = n -2

(B) function f of n = n

(C) function f of n = 2 n

(D) function f of n = 4

(E) function f of n = (2 n) -4