Question

Quantos anagramas da palavra BOTAFOGO começam com a letra "O"?

Answer 1

$\mathsf{P_7^2=\dfrac{7!}{2!}=\dfrac{7\cdot6\cdot5\cdot4\cdot3\cdot \diagup\!\!\!\!2!}{\diagup\!\!\!\!2!}=2520}$