perplexus.info :: Just Math : Last Digit II

Last Digit II (Posted on 2014-03-14)

Can the last digit in the base ten expansion of X^2X 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 X^2X 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
re: Answer	K Sengupta	2022-09-02 22:31:07
Answer	Math Man	2014-03-19 21:04:12
Solution	tomarken	2014-03-14 10:01:09

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