Friday, June 15, 2012

The Last Digit of 3^2153...

Quick puzzler for Friday: What's the last digit (the ones digit that is) of 3^2153?

This question, or some variant of it, has been a common extra credit question in my classes every year. I'll post the answer tomorrow. I tried to make sure it was a question you couldn't just google. Unfortunately, if you really want to cheat, you can still Wolfram Alpha it.  Mathematically speaking, Wolfram Alpha kicks Google's butt, and is a resource you ought to check out frequently. Below are some pretty amazing things Wolfram Alpha can do for you:
How many meters is 52 inches?

1 comment:

Related Posts Plugin for WordPress, Blogger...