Out of 12 consonants and 5 vowels, how many words, each containing 3 consonants and 2 vowels, can be formed?
3 consonants out of 12 consonants can be chosen in 12C3 ways. 2 vowels out of 5 vowels can be chosen in 5C2 ways. And also 5 letters can be written in 5! Ways. Therefore, the number of words can be formed is (12C3 X5C2 X 5!) = 264000.