Asked by lost
What are the last two digits of 7^7^7?
Answers
Answered by
oobleck
7^7 = 823543
The last digit of 7^n cycles through 1,7,9,3,...
823543 divided by 4 leaves a remainder of 3, so the last digit of 7^7^7 is 3
The last digit of 7^n cycles through 1,7,9,3,...
823543 divided by 4 leaves a remainder of 3, so the last digit of 7^7^7 is 3
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