The number of four letter words that can be formed the letters of the word “IITJEE”.

I ) All distinct  $4!=24$
II) 2 similar and 2 distinct $=2\times 3\times \frac{4!}{2!}={72}^{ }$ 
III) (2 similar of one kind) and (2 similar of 2nd kind)  $=\frac{4!}{2!\times 2!}=6$
$\therefore$  Total no. of ways = 102