(In reply to what grade
I'm thinking about 12th grade, if you take calculus.
To follow Josh's post, maybe 11th grade.
note that there are different levels of difficulty at perplexus (1-5);
and this problem is level 4. Don't be discouraged, browse or
search through old problems.
Edited on August 13, 2005, 5:30 am
Posted by Larry
on 2005-08-13 05:28:06