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Get the last digit II (Posted on 2011-02-23) Difficulty: 3 of 5
Let A=1^n+2^n+3^n+...9^n

For a positive integer n what is
the last digit of A?

No Solution Yet Submitted by Ady TZIDON    
Rating: 4.0000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Hints/Tips re: solution.....correction | Comment 3 of 4 |
(In reply to solution by Charlie)

 

Everything is correct in Charlie's presentation, including the
direct formula . 


 However, in the definition of the floor function the
word "smaller "should be replaced by "non greater".

 

So floor(x)=x     iff x is an integer,

Edited on February 24, 2011, 7:57 pm
  Posted by Ady TZIDON on 2011-02-24 19:40:10

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