.

Printable View

- June 5th 2012, 04:46 PMblaydFairechessboard problem with rooks
.

- June 5th 2012, 05:37 PMPlatoRe: chessboard problem with rooks
Consider this: There are ways to select the rows for the three rooks.

Now order the rows from least to most.

There are five ways to place a rook on the least numbered row.

There are four ways to place a rook on the next numbered row in a non-attacking position.

There are three ways to place a rook on the last numbered row in a non-attacking position.