Combinations or groups

C

carlmoody

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Aug 5, 2021
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Using the alphabet a through HH how many 4 letter combinations are there available
 
carlmoody said:
Using the alphabet a through HH how many 4 letter combinations are there available
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To carlmooody, please review your post.
Should it be "Using the alphabet A through H how many 4 letter combinations are there available?
If so then that is a set of eight letters. There are [imath]^{8}\mathcal{P}_4[/imath] permutations but [imath]^{8}\mathcal{C}_4[/imath] combinations.
 
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