Question: How many 7 - letter code words are possible from the first 1 0 letters of the alphabet if no letter is repeated? If letters

How many 7-letter code words are possible from the first 10 letters of the alphabet if no letter is repeated? If letters can be repeated? If adjacent letters must be different?
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Part 1
a. There are
enter your response here possible 7-letter code words if no letter is repeated.

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