How many -letter code words can be formed from the letters N,Q,U,H,I,M if no letter is repeated? If letters can be repeated? If adjacent letters must be different?
Added by Gloria J.
Step 1
If no letter is repeated: We have 6 different letters and we want to form a 6-letter code word. This is a permutation problem. The number of ways to arrange 6 different items in 6 spots is 6! = 720. So, there are 720 different 6-letter code words that can be Show more…
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