Question: Alice wants to create 5-letter security codes using 10 different letters so that a code cannot contain a letter that appears more than twice. How

Alice wants to create 5-letter security codes using 10 different

letters so that a code cannot contain a letter that appears more than twice. How many

choices are there? (Note that order matters.)

**( note that she can use each letter twice but not more than twice)

**i dont want a straight number as an answer, i want to know what i need to do, e.g (20 choose 5 - something)

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