AMC 8 1998 Problem 22
AMC8 1998 年第 22 题
余数与同余★★★★☆
Problem Terri produces a sequence of positive integers by following three rules. She starts with a positive integer, then applies the appropriate rule to the result, and continues in this fashion. Rule 1: If the integer is less than 10, multiply it by 9. Rule 2: If the integer is even and greater than 9, divide it by 2. Rule 3: If the integer is odd and greater than 9, subtract 5 from it. A sample sequence: Find the 98-th term of the sequence that begins
按照以下三条规则生成一个正整数序列。她从一个正整数开始，然后对结果应用适当的规则，并继续以此方式进行。 规则 1：如果整数小于 10，乘以 9。 规则 2：如果整数为偶数且大于 9，除以 2。 规则 3：如果整数为奇数且大于 9，减去 5。 示例序列：。 求以 开头的序列的第 98 项。
- A.6
- B.11
- C.22
- D.27
- E.54
正确答案 · Correct Answer
D
解析 · Solution
解析整理中
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