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11 Jan 2008, 08:11
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I have a hard time coming with a good strategy for DS problems, especially number theory questions ex is X > 0 etc etc.
I know the strategies to use -2, -1 , -1/2 , 0 , 1/2 , 1 , 2
however when you have to compare 2 or more variables, even if you can narrow down that list to all positives, still have a lot of combinations to deal with.
I am not good at manipulating all these numbers in my head under time constraints, so I guess I need a good paper strategy to use? I am aware of paper strategies but sometimes they seem too daunting where I would have 4 columns of variables I'd have to check for let's say 4 types of numbers.
How do the pros solve these problems efficiently?
I know the strategies to use -2, -1 , -1/2 , 0 , 1/2 , 1 , 2
however when you have to compare 2 or more variables, even if you can narrow down that list to all positives, still have a lot of combinations to deal with.
I am not good at manipulating all these numbers in my head under time constraints, so I guess I need a good paper strategy to use? I am aware of paper strategies but sometimes they seem too daunting where I would have 4 columns of variables I'd have to check for let's say 4 types of numbers.
How do the pros solve these problems efficiently?
13 Mar 2008, 08:51
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anyone have a good method for this? I score well on quant 47-48 but DS is lacking.
Walker or any of the top math gurus, do you have a paper approach to testing variables or do you just do it in your head?
Walker or any of the top math gurus, do you have a paper approach to testing variables or do you just do it in your head?
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