Formula:8669

Digital Library of Mathematical Functions ID 26.15.E9

${\displaystyle{\displaystyle r_{k}(B)=\frac{2n}{2n-k}\genfrac{(}{)}{0.0pt}{}{2n-k}{k}.}}$

Symbols List

• ${\displaystyle{\displaystyle\genfrac{(}{)}{0.0pt}{}{\NVar{m}}{\NVar{n}}}}$:
• ${\displaystyle{\displaystyle k}}$: nonnegative integer
• ${\displaystyle{\displaystyle n}}$: nonnegative integer
• ${\displaystyle{\displaystyle B}}$: subset
• ${\displaystyle{\displaystyle r_{j}(B)}}$: number of rook positions
 

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