Out of 7 consonants and 4 vowels, we need to form words with 3 consonants and 2 vowels. We can choose 3 consonants from 7 consonants in $\binom{7}{3}$ ways and 2 vowels from 4 vowels in $\binom{4}{2}$ ways. Then, we can arrange these 5 letters in 5! ways. So, the
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