Posted by Twg on Thursday, August 6, 2009 at 3:21pm.
How many threesymbol codes can be formed from the
letters I, S, P, and Y without repetition?

MATH Prob.  bobpursley, Thursday, August 6, 2009 at 3:55pm
What is 4*3*2?

MATH Prob.  Twg, Thursday, August 6, 2009 at 4:18pm
Can you please show me how you got that answer?

MATH Prob.  Twg, Thursday, August 6, 2009 at 4:20pm
How many threesymbol codes (letternumbernumber)
can be made from the letters S, P, Y, and two digits
from the set {0, 1, 2,....., 9} without repetition?

MATH Prob.  PsyDAG, Friday, August 7, 2009 at 10:46am
As far as your first question, I think bobpursley is referring to 4! called "four factorial."
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