Determine the last but one digit of the following number in decimal notation: 7^((43^20) - 118)
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Determine the last but one digit of the following number in decimal notation: 7^((43^20) - 118)

[From: ] [author: ] [Date: 12-06-25] [Hit: ]
answers.yahoo.......
it seems logical to address this using modular arithmetic, perhaps using mod 100.
Unfortunately, I don't see how to proceed with this.

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if "last but one " means that :
http://uk.answers.yahoo.com/question/ind…

Hint : 7^40 = 1 mod 100
answer = 4
1
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