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)
為什麼呢
有點看不懂題目..Orz
麻煩各位高手了~謝謝
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