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And why is it not 1/6 + 1/6? Thanks

 Nov 4, 2017
 #1
avatar+97561 
+2

The easiest way to work out probablilities with 2 dice is to draw up a 6 by 6 grid. 

Die 2 is down the side

Die 1 is acros the top and 

 

 

  1 2 3 4 5 6
1 1,1 2,1 3,1 4,1 5,1 6,1
2 1,2         6,2
3 1,3         6,3
4 1,4         6,4
5 1,5         6,5
6 1,6 2,6 3,6 4,6 5,5 6,6

 

The red ones are the combinations that work. There are 20 of them

So

P(of a 6 OR a 1)  = 20/36 = 5/9

 Nov 4, 2017

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