it seems logical to address this using modular arithmetic, perhaps using mod 100.
Unfortunately, I don't see how to proceed with this.
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
http://uk.answers.yahoo.com/question/ind…
Hint : 7^40 = 1 mod 100
answer = 4