涛涛　4-16　求助

求教：涛涛4-16

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.

Answer: D

卡住了，不知道应该如何下手。没有找到相关讨论，貌似对大家来说不是难题，可是我怎么都做不出来，急！