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Last Digit II (Posted on 2014-03-14) Difficulty: 2 of 5
Can the last digit in the base ten expansion of X2X be 4, whenever X is a positive integer?

If so, give an example. If not, prove it.

  Submitted by K Sengupta    
Rating: 5.0000 (1 votes)
Solution: (Hide)
The last digit in the base ten expansion of X2X can NEVER be 4.

For an explanation, refer to the solution submitted by Math Man in this location.

tomarken has also furnished an alternative methodology in this location.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Some Thoughtsre: AnswerK Sengupta2022-09-02 22:31:07
SolutionAnswerMath Man2014-03-19 21:04:12
SolutionSolutiontomarken2014-03-14 10:01:09
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