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How many 6-digit combinations AND permutations can be formed from the following set: {1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7,7, 8, 8, 9, 9}? Thank you.

 Aug 22, 2022
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My computer says there are:

 

1,554 combinations, and:

 

430,920 permutations.

 

Melody: Can you please see if you can replicate these numbers using combinatorics? Thanks.

 Aug 22, 2022

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