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How many ways are there for 20 rectangular brick with dimensions

1 X 3 to fill a grid with dimensions 3 X 20 ?

 Aug 10, 2020
 #1
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Can someone please help!!!

 Aug 11, 2020
 #2
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There are 40 + 5 + 2 = 47 ways to fill the grid.

 Aug 15, 2020

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