How many permutations of the letters ABCDEFGH contain a) the string ED? b) the string CDE? c) the strings BA and FGH? d) the strings AB, DE, and GH? e) the strings CAB and BED? f ) the strings BCA and ABF?
Added by Daniel M.
Step 1
There are 7! ways to arrange these entities. So, there are 7! = 5,040 permutations containing the string "ED". Show more…
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