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  4. There are 8 different consonants and 6 different vowels. Number of different words of 7 letters which can be formed, if they are to contain 4 consonants and 3 vowels if the three vowels are to occupy even places is :

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Q. There are 8 different consonants and 6 different vowels. Number of different words of 7 letters which can be formed, if they are to contain 4 consonants and 3 vowels if the three vowels are to occupy even places is :

Permutations and Combinations

Solution:

Correct answer is (b) ${ }^8 P _4 \cdot{ }^6 P _3$