QR Question From Dat Destroyer

[goodie]

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This is a QR question from the destroyer.

"In craps you roll 2 dice. You can win on the first roll if you roll a 7 or 11, and you lose if you roll a 2, 3 or 12. What is the probabolity of winning of losing on the first roll?"

Answer: 6 ways to roll a 7, 2 ways to roll an 11 = 8 ways to win
1 way to roll a 2, 2 ways to roll a 3, and one way to roll a 12 = 4 ways to lose
total possible rolls: 6 x 6 = 36
Probaility of winning or losing therefore is 12/36=1/3.

The part I dont understand is where they got the total possbile rolls, they dont state in the question that the person will roll 6 times...what am I missing!?

 

[phy241]

You only roll once, but what they mean by total possible rolls is that how many different combinations can you possibly have if you roll two dice at once. Each dice can have 6 values, so total possible combinations is 6 x 6 = 36. Hope this helps!

This is a QR question from the destroyer.

"In craps you roll 2 dice. You can win on the first roll if you roll a 7 or 11, and you lose if you roll a 2, 3 or 12. What is the probabolity of winning of losing on the first roll?"

Answer: 6 ways to roll a 7, 2 ways to roll an 11 = 8 ways to win
1 way to roll a 2, 2 ways to roll a 3, and one way to roll a 12 = 4 ways to lose
total possible rolls: 6 x 6 = 36
Probaility of winning or losing therefore is 12/36=1/3.

The part I dont understand is where they got the total possbile rolls, they dont state in the question that the person will roll 6 times...what am I missing!?

 

[goodie]

Thanks phy241! That definitely did help I get it now 🙂