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SAT I 一日一问：2013年3月12日

来源：要点：SAT真题

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[1]题目
[2]答案与解释

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The Correct answer is B.

Explanation

You do not know the value of the second term or the fourth term of the sequence, but you do know the values of the first , third <, and fifth terms. The correct formula must give as the value of the first term, as the value of the third term, and as the value of the fifth term. Choice E, (6 times n) + 5 , gives , not , as the value of the first term. Choice A, (2 times n) + 6 , gives , not , as the value of the third term. Choice C, (5 times n) + 3 , gives , not , as the value of the third term. Choice D, (6 times n) + 2 , gives , not , as the value of the third term. This leaves choice B, (3 times n + 5) , which gives the correct values for the first , third , and fifth terms of the sequence.