There are 9 consonants and 5 vowels. How many words with 7 letters can be formed using 4 consonants and 3 vowels?
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This can be done in C(9, 4) ways, which is equal to 9! / (4! * (9-4)!) = 9! / (4! * 5!) = (9 * 8 * 7 * 6) / (4 * 3 * 2 * 1) = 126 ways. Show more…
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