Which of the following is the last two digits of 7946?

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问题 Which of the following is the last two digits of 7⁹⁴⁶?

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：7¹是07，7²是49，7³是43，7⁴是01，7⁵还是07，到此为止已经足够了，正是因为7⁴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7⁹⁴⁶=7²，所以最后两位数字是49。

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Which of the following is the last two digits of 7946?

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