The number of unique random numbers which need to be selected from the table of random digits is: C. 800.
A random number can be defined as a numerical value that's unique and cannot be predicted based on past or present numerical values.
Based on the information given, the total number of objects are 1,200 and they are to be placed into three (3) equally sized treatment groups.
Each group = 1200/3
Each group = 400 objects.
Selection = 400 × 2
Unique selection = 800 random numbers.
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