11-15-2009, 09:56 AM

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.

[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.

__________________

__________________

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)

__________________

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)