dicey die
By mistake, two dice have been made with the four side replaced with a copy of another side. It is the same error for both dice. Because of the error, the probability of throwing seven is 1/3 less than usual. What has the four side been replaced with?
Labels: Probability
posted by Chris at
6:34 AM
9 Comments:
Hi chris,
Are you positive you haven't made a mistake in copying this problem? The probability of rolling a 7 with a standard set of dice is 1/6...
I don't think it's possible to double that probability in the manner you've suggested.
Hi Cry Wolf. I've copied/rewritten the problem correctly. With normal die, the probability of rolling a 7 is 1/2, not 1/6.
Perhaps I've misunderstood the problem...
You are rolling two six sided dice, adding the results together, and trying to get this result to be exactly 7?
Hi Cry Wolf. You have understood the question correctly. I think you have simply misremembered what the probability of rolling 7 is with regular dice.
Well, I'm not trying to be a jerk, but I am positive that the probability of rolling a 7 by the method described is 1/6. This can be verified by making a table of values with each of the dice on its own axis, verified by entering something such as "What is the probability of rolling a 7 with two dice" into google, or I suppose if you had two dice, it should not take too long to see the result because 1/2 and 1/6 are not very close.
Cry Wolf. I'm wrong. I'm sorry for saying that you were the one in error. My excuse is that it's my birthday weekend and my brain is fried.
I will be correcting the problem in a moment.
3
Ahh, not a problem... hope it's all going well.
Also, what Ragknot said... 3
Hi Cry Wolf and Ragknot. I waited for Cry Wolf before acknowledging that 3 is the correct answer. Thanks for accepting my apology.
I hope normal services will be resumed shortly (but no way will that be today).
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