Posted by KATE on Thursday, October 4, 2007 at 7:29am.
HOW MANY DIFFERENT ARRANGEMENTS ARE THERE OF THE LETTERS IN TESTERS?

MATH  PsyDAG, Thursday, October 4, 2007 at 2:35pm
This is a permutation.
n! (n factorial) = n(n1)(n2)...1
What is your n?
http://en.wikipedia.org/wiki/Permutation
I hope this helps. Thanks for asking.

MATH  PsyDAG, Thursday, October 4, 2007 at 2:43pm
My solution assumed that each letter — even if repeated — was considered different. Thus T1 is considered different from T2 and so on.
I hope this helps a little more. Thanks for asking.
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