Q.
The letters of the word OUGHT are written in all
possible ways and these words are arranged as in a
dictionary, in a series. Then the serial number of
the word TOUGH is :
Lets arrange the letters of OUGHT in alphabetical order.
G, H, O, T, U
Words starting with G−−−−→4 ! H−−−−→4 ! O−−−−→4 ! TG−−−→3 ! TH−−−⟶3 ! TOG−−→2 ! TOH−−→2 ! TOUGH→1 !
Total =89