A 600 to 650 level GMAT permutation practice question.
Sampling with replacement where order matters.
Question
In how many ways can 5 letters be posted in 3 post boxes, if any number of letters can be posted in all of the three post boxes?
A. 5C3
B. 5P3
C. 5^3
D. 3^5
E. 2^5
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