Concept explainers
In Exercises 45-72, use permutations, combinations, the fundamental counting principle, or other counting methods, as appropriate.
Identification Numbers in Research Subject identification numbers in a certain scientific research project consist of three letters followed by three digits and then three more letters. Assume repetitions are not allowed within any of the three groups, but letters in the first group of three may occur also in the last group of three. How many distinct identification numbers are possible?

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