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Get the last digit (Posted on 2011-01-17) Difficulty: 2 of 5
Let A=2^n+3^n+7^n
For a given positive integer n what is the last digit of A?

  Submitted by Ady TZIDON    
Rating: 4.0000 (2 votes)
Solution: (Hide)
If n mod 4 is 1 or 2 ,the last digit is 8, else it is 2.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionNo SubjectCharlie2011-01-17 18:14:02
SolutionSolutionKenny M2011-01-17 16:01:52
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