From 5 consonants and 4 vowels, how many words can be formed using 3 consonants and 2 vowels ?

From 5 consonants, 3 consonants can be selected in  $5C3$ ways.

From 4 vowels, 2 vowels can be selected in  $4C2$ ways.

Now with every selection, number of ways of arranging 5 letters is $5P5$ways.

Total number of words =  $5C3*4C2*5P5$

                                = 10x 6 x 5 x 4 x 3 x 2 x 1= 7200