All letters of PUBLIC written in all possible orders (dictionary). Serial number of PUBLIC is
Step-by-Step Solution
Key Concept: Alphabetical order: B,C,I,L,P,U. Words starting with B,C,I,L: $4\times4!=96$ each, total $4\times5!=480$. Then count P-words before PUBLIC.
Serial number $=582$.
Correct Answer: 4