(c) : Arrange the letters of the word COCHIN as in the order of dictionary CCHINO. $\\$ Consider the words starting from C. $\\$ There are 5 ! such words. Number of words with the two C's occupying first and second place $=4!$. $\\$ Number of words starting with CH, CI, CN is 4 ! each. $\\$ Similarly, number of words before the first word starting with $\mathrm{CO}=4!+4!+4!+ 4!=96$. $\\$ The word starting with CO found first in the dictionary is COCHIN . There are 96 words before COCHIN.