In the word INIEGER, we have S letters other than 'I' and ‘N’ of which two are identical (E's). We can arrange
these letters in ways. In any such arrangements, 'l' and 'N can be placed in 6 available gaps in , ways.
So, required number =
Now, if word 8ta!t with 'I' and end with' R, then the remaining letters are 5.
So, total number of