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avatar+539 

An ordinary \(6\)-sided die has a number on each face from \(1\) to \(6\) (each number appears on one face). How many ways can I paint two faces of a die red, so that the numbers on the red faces don't add up to \(7\)?

 Oct 18, 2018
 #1
avatar+94321 
+1

Combos that don't add to  7  are

 

[ 1. 2 ]  [1,3 ] [1, 4 ] [1,5 ]

[ 2, 3 ]   [ 2, 4 ]

 

6 ways

 

cool cool cool

 Oct 18, 2018

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