四、 證明題：
The sequence {a
n}：1, 1/2, 1/3,….Is it possible to select a subsequence from {an} such that each term in it (except the first two) is the difference of the preceding two?
(1) for 5 terms sequence b1, b2, ⋯ , b5
(2) infinite terms sequence {cn}.
Explain your answer!
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