Posted by **Twg** on Thursday, August 6, 2009 at 3:21pm.

How many three-symbol 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 three-symbol codes (letter-number-number)

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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