Consider the letters of the word CYBERPUNK. There are nine letters without repeats, so therefore there are 9! (=362880) different ways of arranging them.
If you place those 362880 ways in alphabetical order and number them: 1=BCEKNPRUY, 2=BCEKNPRYU, 3=BCEKNPURY, … 362880=YURPNKECB, which number is CYBERPUNK?
Bonus question: which string of letters will be 100,000th in the sequence?