求一道题的翻译，NN帮忙~~~~

gabriel1981

Prep的一道题，题意看不懂，判指点：

For a finite sequence of non zero numbers, the number of variations in the 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?

1)1
2)2
3)3
4)4
5)5

cindytim

问的就是有多少对两个相邻的数的乘机为负？ 答案应该是3吧

gabriel1981

是3，谢谢楼上。拿这个短语 the number of variations in the sign 有什么固定意思吗？

冷咖啡

没啥固定含义，就是说不同的数的number