How many different codes can be formed?

GRE Quant Problem Solving
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I got correct answer by doing this but I didn’t understand why I should divide 5! by (3! x 2!).

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could you let me know which book is this??
identical numbers arranged ie. 2 and 3 can be in different places.

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Okay so if we get the identical numbers, we need to arrange them as well. Got it!
Anyway, the book is GRE-2 , Jamboree Edition 2020.