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16 Mar 2016, 11:12
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
91% (00:27) correct
9%
(00:17)
wrong
based on 61
sessions
History
Date
Time
Result
Not Attempted Yet
16 Mar 2016, 11:49
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Bunuel
(1)
we dont know about A .so insuff
(2)
we dont know about B.so insuff
combining (1) and (2)
subtract both to get B-A>0----->B>A...suff
Ans C
16 Mar 2016, 18:35
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Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
If A and B are integers, is B > A?
(1) B > 10
(2) A < 10
In the original condition, there are 2 variables(A,B), which should match with the number of equations. So you need 2 equations. For 1) 1 equation, for 2) 1 equation, which is likely to make C the answer. When 1) & 2), B>10>A becomes B>A, which is always yes and sufficient.
Therefore, the answer is C.
For cases where we need 2 more equations, such as original conditions with “2 variables”, or “3 variables and 1 equation”, or “4 variables and 2 equations”, we have 1 equation each in both 1) and 2). Therefore, there is 70% chance that C is the answer, while E has 25% chance. These two are the majority. In case of common mistake type 3,4, the answer may be from A, B or D but there is only 5% chance. Since C is most likely to be the answer using 1) and 2) separately according to DS definition (It saves us time). Obviously there may be cases where the answer is A, B, D or E.
If A and B are integers, is B > A?
(1) B > 10
(2) A < 10
In the original condition, there are 2 variables(A,B), which should match with the number of equations. So you need 2 equations. For 1) 1 equation, for 2) 1 equation, which is likely to make C the answer. When 1) & 2), B>10>A becomes B>A, which is always yes and sufficient.
Therefore, the answer is C.
For cases where we need 2 more equations, such as original conditions with “2 variables”, or “3 variables and 1 equation”, or “4 variables and 2 equations”, we have 1 equation each in both 1) and 2). Therefore, there is 70% chance that C is the answer, while E has 25% chance. These two are the majority. In case of common mistake type 3,4, the answer may be from A, B or D but there is only 5% chance. Since C is most likely to be the answer using 1) and 2) separately according to DS definition (It saves us time). Obviously there may be cases where the answer is A, B, D or E.
