2. 外语
  3. the unit’s digit of 7n is x and the unit’s digit of 3n is y where n is a positive integer Quantity A: |x-y| Quantity B: 3

the unit’s digit of 7n is x and the unit’s digit of 3n is y where n is a positive integer Quantity A: |x-y| Quantity B: 3

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问题 the unit’s digit of 7n is x and the unit’s digit of 3n is y where n is a positive integer
Quantity A: |x-y|
Quantity B: 3
选项 A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.
答案D
解析 7n对应的个位数循环特征是7，9，3，1，3n对应的个位数循环特征是3，9，7，1，两者对应项相减差的绝对值为4，0，4，0，和3无法比较，选择D。
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