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A chess rook is on the leftmost cell of the 1×30 lane and can move any number of cells, but only to the right. In how many ways can the rook move to the rightmost cell?

 Oct 13, 2019
 #1
avatar+439 
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try drawing a chessboard first.

 Oct 13, 2019
 #4
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do you know the answer because I need it for tomorrow and it makes no sense to me.

Guest Oct 20, 2019
 #2
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I was still stuck

 Oct 13, 2019
 #3
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A 1 * 30 lane? I am confused, a chess board is 8 * 8

 

 

is there a picture that comes with the problem?

CalculatorUser  Oct 13, 2019

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