23. There are 120 different ways of arranging the letters, $\mathrm{U}, \mathrm{K}, \mathrm{M}, \mathrm{I}$ and $\mathrm{C}$. All of these arrangements are listed in dictionary order, starting with CIKMU. Which position in the list does UKIMC occupy?
A 110 th
B 112 th
C 114 th
D 116 th
E 118 th
23. B The permutations which follow UKIMC in dictionary order are UKMCI, UKMIC, UMCIK, UMCKI, UMICK, UMIKC, UMKCI, UMKIC. There are eight of these, so UKIMC is 112 th in the list.