作者MiniWater (MiniWater)
看板GMAT
标题[计量] PP-PS1 #19
时间Mon Jan 7 22:37:59 2008
For a finite sequence of nonzero numbers, the number of variations in sign is
defined as the number of pairs of consecutive terms of the sequence for which
the product of the two consecutive terms is negative. What is the number of
variations in sign for the sequence 1, -3, 2, 5, -4, -6 ?
(A) One
(B) Two
(C) Three
(D) Four
(E) Five
答案是(C)
为什麽呢
有点看不懂题目..Orz
麻烦各位高手了~谢谢
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