Question: Please provide work and answer. I believe it is one of the counting rules, but I cannot seem to get the right answer. Thank you!

Please provide work and answer. I believe it is one of the counting rules, but I cannot seem to get the right answer. Thank you!

A new model car from Ford Motor Company offers a keyless entry system that utilizes a four-lettter-code. How many different possible combinations are there for the code?

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