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Which of the following is the last two digits of 7946?
Which of the following is the last two digits of 7946?
admin
2022-11-20
43
问题
Which of the following is the last two digits of 7
946
?
选项
A、17
B、29
C、49
D、31
E、43
答案
C
解析
对于最后两位数字来说:7
1
是07,7
2
是49,7
3
是43,7
4
是01,7
5
还是07,到此为止已经足够了,正是因为7
4
是01才导致7的n次方的最后两位数字是以4为循环的,这样7
946
=7
2
,所以最后两位数字是49。
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