1994 AMC 8 第 15 题
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15.
如果这条路径按相同规律继续,那么从点 到点 的箭头序列是哪一个?
If this path is to continue in the same pattern, then which sequence of arrows goes from point to point
小提示:
箭头按长度为 的周期重复,所以某点出发的箭头只取决于它除以 的余数
The arrows repeat in a cycle of length , so a point’s outgoing arrows depend only on its remainder when divided by .
大提示:
因为 和 除以 的余数分别是 和 ,所以箭头与从点 到点 的箭头相同
Since and leave remainders and when divided by , the arrows match those going from point to point .
解答:
这个模式每 个点重复一次,所以从某点出发的箭头只取决于它除以 的余数。
因为 ,且 ,所以从 到 的路径与从点 到点 相同:从 向上到 ,再向右到 。
所以正确答案是 A。
The pattern repeats every points, so the arrows leaving a point depend only on its remainder upon division by
Because and the path from to looks just like the path from point to point : from it goes up to then right to
Thus, the correct answer is A .
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