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Thank you so much! Thinking in terms of order and no order was completely throwing me off.
I keep doubting myself that I am calculating the following problem incorrectly:
How many sequences of three letters can be made from the letters {A, B, C, D, E} if
(a) The letters must be all different.
I would assume that I would use the permutation equation to solve this. Pn,r = n!/(n-r)!
(b) Repetitions are allowed.
I would assume I would use the combination equation to solve this. Cn,r = n!/r!(n-r)!
If anyone can verify whether that is correct or incorrect I would greatly appreciate it. Thanks!
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