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silverprince
GMAT 1: 660 Q42 V38
Posts: 25
23 May 2020, 05:02
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Hi GMAT Club
When solving GMAT questions, I have noticed that I have a unique error type that I am repeating over and over again without noticing. I seem to take note of boundary conditions, but forget to apply them later on in the question. I'll give an example of this error in the form of a simple OG GMAT quant DS question. (NB I'm not looking for the solution to the quant question, I'm looking for help with my error type)
Question prompt
What is the remainder when the positive integer x is divided by 6?
(1) When x is divided by 2, the remainder is 1; and when x is divided by 3, the remainder is 0.
(2) When x is divided by 12, the remainder is 3.
My approach
on my pad, I note down the following:
(1) "X must be odd"
"X is a multiple of 3"
I then start listing the multiples of 3 and work out what the remainders are when each is divided by 6 - and here is where I make my error. I forget the fact that x is odd and start testing both ODD and EVEN multiples of 3.
I find this very frustrating and I would really appreciate anyone's advice on how I can resolve this error type?
Thanks!
When solving GMAT questions, I have noticed that I have a unique error type that I am repeating over and over again without noticing. I seem to take note of boundary conditions, but forget to apply them later on in the question. I'll give an example of this error in the form of a simple OG GMAT quant DS question. (NB I'm not looking for the solution to the quant question, I'm looking for help with my error type)
Question prompt
What is the remainder when the positive integer x is divided by 6?
(1) When x is divided by 2, the remainder is 1; and when x is divided by 3, the remainder is 0.
(2) When x is divided by 12, the remainder is 3.
My approach
on my pad, I note down the following:
(1) "X must be odd"
"X is a multiple of 3"
I then start listing the multiples of 3 and work out what the remainders are when each is divided by 6 - and here is where I make my error. I forget the fact that x is odd and start testing both ODD and EVEN multiples of 3.
I find this very frustrating and I would really appreciate anyone's advice on how I can resolve this error type?
Thanks!
23 May 2020, 08:33
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silverprince
Hi silverprince
Asked: What is the remainder when the positive integer x is divided by 6?
(1) When x is divided by 2, the remainder is 1; and when x is divided by 3, the remainder is 0.
xmod2 = 1; x is odd; xmod3= 0; x = 3k
x = 3k; where k is odd
x = 3(2m+1); where m is an integer
x = 6m + 3
xmod6 = 3
SUFFICIENT
(2) When x is divided by 12, the remainder is 3.
xmod12 =3
x = 12k + 3
x = 6(2k) +3 = 6m + 3
xmod6 = 3
SUFFICIENT
IMO D
Hope it helps!
23 May 2020, 16:14
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Hi silverprince
You can try using the analysis points one at a time instead of writing all points and solving them together.
For example,
"x must be odd": get all the odd numbers first. 1,3,5,7,etc
then bring your second analysis on the above data from the first analysis: "x must be a multiple of 3" which is 3,9,15,etc
In this way you will narrow down your options which will reduce your confusion. You can try this for a few questions to get into the process and once you get better, it might not be a problem anymore.
I hope this helps. Give it a try if you have not already tried it. Good luck
You can try using the analysis points one at a time instead of writing all points and solving them together.
For example,
"x must be odd": get all the odd numbers first. 1,3,5,7,etc
then bring your second analysis on the above data from the first analysis: "x must be a multiple of 3" which is 3,9,15,etc
In this way you will narrow down your options which will reduce your confusion. You can try this for a few questions to get into the process and once you get better, it might not be a problem anymore.
I hope this helps. Give it a try if you have not already tried it. Good luck
