[PatrickBateman]

Sorry I am not a math guy. I know some of you are and would just like to know something about craps. If I set the dice at say (4,2) what are the chances of hitting just one of those numbers on the roll?

[Justin7]

Sorry I am not a math guy. I know some of you are and would just like to know something about craps. If I set the dice at say (4,2) what are the chances of hitting just one of those numbers on the roll?

You want to know the odds that in the two dice you threw, there is exactly 1 "2", 2 "2s", 1 "4" or 2 "4"s?

[wiffle]

50/50

it either happens or it doesnt

[ThaWoj]

i believe it would be 1/3 (4/12) because the OP is not asking for a specific combination, just the odds of any 2 or any 4 coming up on specific throw of both dice at the same time. so theres two possible '2's and two possible '4's out of 12 possible numbers to be tossed

justin correct me if im wrong.

[u21c3f6]

Sorry I am not a math guy. I know some of you are and would just like to know something about craps. If I set the dice at say (4,2) what are the chances of hitting just one of those numbers on the roll?

If you are referring to trying to control the dice, then it depends in part on your skill.

There are many throwers that after a point is established will set the dice with the threes in a V such that no two sides has a seven. The idea is that if you can throw the dice so that both will rotate equally, the expectation is less sevens will be thrown.

Joe.

[Waterstpub87]

1 in 18 for a 4 2. If you are asking what is the chance of one dice showing a 4 or another the 2 at the end of the roll, it would be 1/6 +1/6= 2/6 = 1/3

[smmtea]

i understand the question to be that you throw two dice (or one die twice) and you want to know what is the chance of rolling a 2 or a 4 at least one time.
the answer is 20/36. the easiest way to figure this out is to see what the chances of not throwing a 2 or a 4 are. the chances of not throwing a 2 or a 4 are 4/6*4/6=16/36. so then the chances of throwing a 2 or a 4 are 1-(16/36)=20/36.

it is not 1/6+1/6. the chances of getting a 2 or a 4 on one die throw is 2/6. the chance of getting a 2 or a 4 on two die throws is not 2/6+2/6. if it were, then throwing a die 3 times would be 2/6+2/6+2/6 = 1. that is, throwing a die 3 times would mean a 100% chance of getting a 2 or a 4, and this is obviously false.

i hope that is somewhat clear.

[Justin7]

The odds of getting a "2" or "4" on a single die is 1/3. The odds of not rolling a "2" or "4" on a single die is 2/3.

The odds of not rolling either a "2" or "4" on two consecutive single die rolls (or one single craps roll of two dice) is (2/3)^2, or 4/9.

The odds of rolling at least one 2" or "4" on a two-dice craps throw is 1 - 4/9, or 5/9.

[PatrickBateman]

See I knew the math geniuses would come out to help me. Thanks guys.

Now what is this "V" with 3's someone mentioned earlier. What is the logic behind that?

Thanks again, good stuff

[ThaWoj]

that poster was talking about "setting" the dice.

check out www.dicecoach.com/dicesets.asp

[PatrickBateman]

Thanks ThaWoj, now does that really have any effect on making you a better dice roller? Does it even give a slight edge to non-dice setters?

[ThaWoj]

in my personal opinion, i dont think so. you would have to practice for years to even have it be a slight edge. the rule that makes you shoot from at least past 1/2 the table makes it too far of a distance to be able to be efficient at doing it. the only possible way is to just constantly set the dice the same way each time, use the EXACT same arm motion every time, and have them land in the EXACT same spot on the table every time....pretty tough to do unless you dedicate your life to it lol

[Flight]

Some pretty bad answers in this thread, but I guess you got the answer in the end?


Dice setting in craps is hilarious - I've played with so many old guys that spend 20 seconds on each throw putting them perfectly into position, staring them down, tossing them exactly the same each time. The result? They throw the exact same dice probability as me or anyone else. It is a giant waste of time.

I'm not saying there aren't people that can gain an edge - there are. But the amount of people that try to set dice in a live casino versus the people that actually do is a comically small proportion.

So much superstition among gamblers, craps players especially, but also roulette, blackjack, baccarat, etc.

Superstition has to be the #1 downfall of the average gambler (with martingale systems taking 2nd)

[2tddog]

I believe it is 36 to there are 36 possible combinations