Indistinguishable 48981

How many ways can we build eight indistinguishable towers on an 8 × 8 board, so they don't endanger each other?

Correct answer:

n =  40320

Step-by-step explanation:

Axxxxxxx xBxxxxxx xxCxxxxx xxxDxxxx xxxxExxx xxxxxFxx xxxxxxGx xxxxxxxH  n=8!=40320

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