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How many permutations of this set can be made?
2013年3月20日 · How many permutations of the set of seven letters (A,B,C,D,E,F,G) have the two vowels before the five consonants?
2013年3月20日 · How many permutations of the set of seven letters (A,B,C,D,E,F,G) have the two vowels before the five consonants?