perplexus.info :: Numbers : Rooks on a chessboard

Rooks on a chessboard (Posted on 2018-11-26)

How many ways are there to place two rooks on the same column or same row on a nxn chessboard?

Submitted by Ady TZIDON

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Solution: (Hide)

2 white rooks n^3-n^2 ways
2 black rooks n^3-n^2 ways
1 white and 1 black rooks 2* (n^3-n^2 ) nways
answer:2* (n^3-n^2 ) nways

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
correcting a typo in puzle's solution	Ady TZIDON	2018-11-30 09:37:45
re(2): soln attempt	Steven Lord	2018-11-26 23:46:27
re: soln attempt	Ady TZIDON	2018-11-26 12:27:38
soln attempt	Steven Lord	2018-11-26 09:50:32

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