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A six sided die whose faces are -2, -1, 0, 0, 1, 2. The die is rolled 3times.Find the probability that the sum of the 3 numberssherolls is zero (in a fraction)

 Dec 24, 2018
 #1
avatar+98005 
+1

-2, -1, 0, 0, 1, 2

 

We have 6C3  =  20 possible sets of outcomes  [order doesn't matter ]

 

(-2, -1, 0)  (-2, -1, 0) (-2, - 1, 1) ( -2, - 1, 2)

(-2, 0, 0) (-2, 0, 1) (-2, 0, 2)

(-2, 0,1) (-2, 0, 2)

(-2,1,2)

(-1,0,0)  (-1, 0, 1) (-1, 0,2)

(-1,0, 1) (-1, 0, 2)

(-1,1,2)

(0,0,1) (0, 0, 2)

(0, 1, 2)

(0, 1, 2)

 

The probability  is    4 outcomes / 20  outcomes =    1 / 5

 

 

 

cool cool cool

 Dec 24, 2018
 #2
avatar+107 
+1

thank you

MacTyBoys  Dec 24, 2018

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