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题库 / Prep2007E1-DS-79
If the terms of a sequence are t1, t2, t3, . . . , tn, what is the value of n ?
(1) The sum of the n terms is 3,124.
(2) The average (arithmetic mean) of the n terms is 4.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
sequence就是普通的数列的意思，题干没有说是连续数列，但这题跟数列具体啥样没有关系。n terms = 这n个数（t1-tn）
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