Question 1191409
How many three-digit numbers can be formed from the digits 1,2,3,4:
A. If repetition of the digits is permitted?
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Each selection is 1 of 4.  What do you think?
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B. If repetition of the digits is not permitted?
The 1st selection is 1 of 4, then 1 of 3, then 1 of 2.