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All you math geniuses
#1
Below is a probability problem, that I can't come up with the same answer as ETS on the sample college math exam. Can anyone help?

[I]The faces of a fair cube are numbered 1 through 6; the probability of rolling any number from 1 through 6 is equally likely. If the cube is rolled twice, what is the probability that an even number will appear on the top face in the first roll or that the number 1 will appear on the top face in the second roll[/I]

So as explained in the "Cracking the Clep" book, I figured the first roll would be 3/6 and the second roll would be 1/6. Add those together and you get 4/6, reduced to 2/3. That is one of the answers but they say the correct answer is 7/12. Where am I going wrong?

Urg, I am never gonna get through this exam.
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cate
BS (UMUC) in 2010, 30+ years in the making!!

Intro to Computing 63
Astronomy 63
Technical Writing 62
Principles of Mgt 71
Principles of Marketing 68
Substance Abuse 467
College Math 56
Principles of Finance 425
Principles of Statistics 458

Exams: ALL DONE!!!!!!!!!!

GRADUATION--UMUC--MAY 15, 2010 (unbelievable)
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  • will1030
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#2
This is from Yahoo answers. Looks like the same problem.
Good Luck,
Bob


Fair cube probability question? - Yahoo! Answers
A.A. Penn State
B.A. Charter Oak State College
M.B.A. Andrew Jackson University In Progress
[-] The following 1 user Likes Bob's post:
  • will1030
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#3
You are my hero! How did you find that, it was exactly the same problem?

Thank you!
__________________
__________________

cate
BS (UMUC) in 2010, 30+ years in the making!!

Intro to Computing 63
Astronomy 63
Technical Writing 62
Principles of Mgt 71
Principles of Marketing 68
Substance Abuse 467
College Math 56
Principles of Finance 425
Principles of Statistics 458

Exams: ALL DONE!!!!!!!!!!

GRADUATION--UMUC--MAY 15, 2010 (unbelievable)
Reply
#4
Quote:You are my hero! How did you find that, it was exactly the same problem?

I cut and pasted the first half of the problem only into google and that brought up a different problem, so I pasted the second half only and up came your problem. Glad I could help.
Bob
A.A. Penn State
B.A. Charter Oak State College
M.B.A. Andrew Jackson University In Progress
Reply
#5
Once again. InstantCert Forum is my hero. Thank you!!!
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