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09 Mar 2016, 13:04
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
70% (01:15) correct
30%
(01:26)
wrong
based on 233
sessions
History
Date
Time
Result
Not Attempted Yet
When two dice are rolled, what is the probability that the difference between the two numbers is 2?
(A) 1/9
(B) 2/9
(C) 1/3
(D) 2/3
(E) None of the above
(A) 1/9
(B) 2/9
(C) 1/3
(D) 2/3
(E) None of the above
09 Mar 2016, 14:06
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We have 8 outcomes that satisfy the question:
1-3
2-4
3-1 or 3-5
4-2 or 4-6
5-3
6-4.
For the first, second, fifth and sixth pairs the probability is (1/6*1/6)*4= 4/36. For fifth and sixth pairs probability is (1/6*2/6)*2=4/36, and the sum of all possibilities is 4/36+4/36=8/36=2/9
I think the answer is B
1-3
2-4
3-1 or 3-5
4-2 or 4-6
5-3
6-4.
For the first, second, fifth and sixth pairs the probability is (1/6*1/6)*4= 4/36. For fifth and sixth pairs probability is (1/6*2/6)*2=4/36, and the sum of all possibilities is 4/36+4/36=8/36=2/9
I think the answer is B
10 Mar 2016, 21:36
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Hi AlexIV,
Your work here is perfect, but it looks like you did a bunch of 'extra' math that wasn't necessary.
When you roll two 6-sided dice, there are (6)(6) = 36 possible outcomes. Once you listed the 8 options that 'fit' what the question was looking for, all you had to do was reduce the fraction:
8/36 = 2/9
Final Answer:
GMAT assassins aren't born, they're made,
Rich
Your work here is perfect, but it looks like you did a bunch of 'extra' math that wasn't necessary.
When you roll two 6-sided dice, there are (6)(6) = 36 possible outcomes. Once you listed the 8 options that 'fit' what the question was looking for, all you had to do was reduce the fraction:
8/36 = 2/9
Final Answer:
GMAT assassins aren't born, they're made,
Rich
