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At one point, she believed GMAT wasn’t for her. After scoring 595, self-doubt crept in and she questioned her potential. But instead of quitting, she made the right strategic changes. The result? A remarkable comeback to 695. Check out how Saakshi did it.
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24 Nov 2016, 02:36
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A
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:
73% (01:32) correct
28%
(02:01)
wrong
based on 80
sessions
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Math Revolution Daily quiz (Day 19)
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Just spare 15 minutes to study each day, and you will be amazed by significant improvement in GMAT Math!
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Attachment:
11.24(a).png [ 54.05 KiB | Viewed 2803 times ]
Just spare 15 minutes to study each day, and you will be amazed by significant improvement in GMAT Math!
“If you like this question, consider subscribing to our 15 minutes a Day Daily Quiz"
Receive "Up-To-Date" 5 math questions and solutions everyday through e-mail
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RaguramanS
Joined: 17 Feb 2016
Last visit: 09 Feb 2018
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Location: India
Concentration: General Management, Entrepreneurship
Schools: Rutgers '18 ISB '18 Great Lakes '18 Sloan '18
GMAT 1: 660 Q47 V36
GPA: 3.12
WE:Education (Internet and New Media)
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14 Jun 2017, 23:00
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Set A: -5,-4,--3,-2,-1
Set B: -2,-1,0,1
P(Sum is non positive)=\(\frac{No of desirable outcomes}{Total outcomes}\)
A has 5 numbers and B has 4 numbers
each value of A can be added with 4 values of B
Total outcome=5*4=20
Desirable outcome= Sum either negative or zero
The sum of every element of A and B is either negative or zero(-5+-2=-7; -4-1=-5 and so on)
Hence Desirable outcome=20
Prob=\frac{20}{20}\(\)=1
Set B: -2,-1,0,1
P(Sum is non positive)=\(\frac{No of desirable outcomes}{Total outcomes}\)
A has 5 numbers and B has 4 numbers
each value of A can be added with 4 values of B
Total outcome=5*4=20
Desirable outcome= Sum either negative or zero
The sum of every element of A and B is either negative or zero(-5+-2=-7; -4-1=-5 and so on)
Hence Desirable outcome=20
Prob=\frac{20}{20}\(\)=1
13 May 2022, 06:15
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If we just take the largest number from each set, we have -1 from set A and 1 from set B. Add those together and you've got 0. That's the LARGEST sum you can get. So all the others must be either zero or negative, also. They are all zero or negative...every one of them!
Answer choice A.
Rant on
A really common mistake many test-takers make is applying math concepts that they learn in school when there's no need to do so. A question like this isn't on the GMAT in order to for business schools to find out whether you know the intricacies of permutations, combinations, or set theory. It's on there to test HOW YOU THINK. Business (school) isn't about showing the world how smart you are because you know math; it's about solving problems and doing things better than they've been done before. Can you come up with a way to get the right answer faster and with a decreased probability of making a mistake? Sure, there are times when you do need to know how to do the math, but if you make your GMAT studying all about mastering math and don't spend a good deal of time learning to THINK through questions without diving into the math, you're missing a huge opportunity to improve your problem solving speed and to make fewer mistakes, which means you're missing a huge opportunity to GET A BETTER SCORE. I see a ton of students who think doing the hard math somehow shows that they're smarter. Nope. Getting the right answer faster and more easily is smarter. Doing things the harder way is, well, not that smart.
/Rant off
Answer choice A.
Rant on
A really common mistake many test-takers make is applying math concepts that they learn in school when there's no need to do so. A question like this isn't on the GMAT in order to for business schools to find out whether you know the intricacies of permutations, combinations, or set theory. It's on there to test HOW YOU THINK. Business (school) isn't about showing the world how smart you are because you know math; it's about solving problems and doing things better than they've been done before. Can you come up with a way to get the right answer faster and with a decreased probability of making a mistake? Sure, there are times when you do need to know how to do the math, but if you make your GMAT studying all about mastering math and don't spend a good deal of time learning to THINK through questions without diving into the math, you're missing a huge opportunity to improve your problem solving speed and to make fewer mistakes, which means you're missing a huge opportunity to GET A BETTER SCORE. I see a ton of students who think doing the hard math somehow shows that they're smarter. Nope. Getting the right answer faster and more easily is smarter. Doing things the harder way is, well, not that smart.
/Rant off
