Letters in ascending order according to dictionary are ADIIN
Total number of words starts with letter A = 4!/2! = 12
Total number of words starts with letter D = 4!/2! = 12
Total number of words starts with letter I = 4! = 24
\(\therefore\) 48th word = INIDA
47th word = INIAD
46th word = INDIA
Alternative:-
Total number of words start with letter A = 4!/2! = 12
Total number of words start with letter D = 4!/2! = 12
Total number of words start with letter IA = 3! = 6
Total number of words start with letter ID =3! = 6
Total number of words start with letter II =3! = 6
Total number of words start with letter INA =2! = 2
\(\therefore\) 44th word is INAID
45th word is INDAI
46th word is INDIA