Which one is greater between the units digit of 7123 and the units digit of 3321?

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问题 Which one is greater between the units digit of 7123 and the units digit of 3321?

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C

解析 既然尾数每4次循环一次,那么把幂指数除以4,根据余数就可求得尾数大小。7123的幂指数123除以4余3,因而7123的个位和73个位是一样的;73的个位为3,因此7123的个位为3;同理:3321幂指数321除以4余1,因此3321的个位和31个位是一样的,而31的个位为3,因而3321的个位为3,所以7123和3321个位相同。正确答案为C。
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本试题收录于: GRE QUANTITATIVE题库GRE分类
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