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(18 points) How many permutations of letters ABCDEFGH contain (a) the string ED ? (b) the string CDE ? (c) the strings BA and FGH
(18 points) How many permutations of 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
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