SOLUTION: What is the last digit of the number 77^77 ?

Algebra ->  Human-and-algebraic-language -> SOLUTION: What is the last digit of the number 77^77 ?      Log On


   

Question 221161: What is the last digit of the number 77^77 ?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
It's 7.
--------
The 1s digit is cyclic. It goes
7
9
3
1
7
9
3
1
Every 4th power it's 1. 77 = 19*4 + 1 --> 7