GWD MATH 4-16

qianyangnet · 发表于 2011-7-25 11:37:28

In the sequence of nonzero numbers t₁, t₂, t₃, …, t_n, …, t_n+1 = t_n / 2 for all positive integers n.What is the value of t₅?
(1)t₃ = 1/4
(2)t₁- t₅ = 15/16

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是D，我其实没太读懂题，请大家指教，谢谢！

nyonyo · 发表于 2011-7-25 12:45:52

t1, t2, t3, …, tn, …, tn+1 = tn / 2 这个sequence代表的以1/2为q的等比数列。

qianyangnet · 发表于 2011-7-28 10:58:41

不好意思，还是没懂，能再指点一下吗

qianyangnet · 发表于 2011-7-30 00:06:56

顶一下，求解！

GWD MATH 4-16

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