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[Math Revolution] Practice "Math Questions of the Day"

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Math Revolution GMAT Instructor
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GMAT 1: 760 Q51 V42
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[Math Revolution] Practice "Math Questions of the Day"  [#permalink]

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New post 25 Dec 2018, 21:09
To help you sharpen your math skills and hit your target score of Q49-51, we are sending you 4 math questions (2 DS, 2 PS) and solutions regularly.
These questions are the types of questions appearing in GMAT exam frequently.

Please Click the link for solutions.

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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
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[Math Revolution] Practice "Math Questions of the Day"  [#permalink]

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New post Updated on: 31 Dec 2018, 20:06
MathRevolution

hi in the 2nd DS no property question, in the first statement you have said in solution that if 0 is taken the statement stands not sufficient..
Please correct me if i am wrong , but '0' is neither a +ve or - ve integer ; and also in the question stem its given that n is a +ve integer ; so why '0' has been taken?
'0' could have been considered if the question stem said that n is an integer or a non +ve or non -ve integer .. but in this case it specifically says +ve integer which IMO '0' should not to be tested to check validity of the statements..

Positive and Negative
Definition: A positive number is a real number that is greater than zero. A negative number is a real number that is smaller than zero.
Zero is not positive, nor negative.

Property about '0' ; its an even integer but its neither +ve or -ve..

IMO B should be correct option
Kindly advise..
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Originally posted by Archit3110 on 26 Dec 2018, 04:14.
Last edited by Archit3110 on 31 Dec 2018, 20:06, edited 1 time in total.
Math Revolution GMAT Instructor
User avatar
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Joined: 16 Aug 2015
Posts: 7462
GMAT 1: 760 Q51 V42
GPA: 3.82
Re: [Math Revolution] Practice "Math Questions of the Day"  [#permalink]

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New post 31 Dec 2018, 09:49
Archit3110 wrote:
MathRevolution

hi in the 2nd DS no property question, in the first statement you have said in solution that if 0 is taken the statement stands not sufficient..
Please correct me if i am wrong , but '0' is neither a +ve or - ve integer ; and also in the question stem its given that n is a +ve integer ; so why '0' has been taken?
'0' could have been considered if the question stem said that n is an integer or a non +ve or non -ve integer .. but in this case it specifically says +ve integer which IMO '0' should not to be tested to check validity of the statements..

Positive and Negative
Definition: A positive number is a real number that is greater than zero. A negative number is a real number that is smaller than zero.
Zero is not positive, nor negative.

Property about '0' ; its an even integer but its neither +ve or -ve..

IMO D should be correct option
Kindly advise..



Oh, you are right.
n shouldn't be zero. The solution should be fixed in the following way.

If n = 2, then 3^4 + 3^{n+4} = 3^4 + 3^6 = 81 + 729 = 810, and the answer is 'yes'.
If n = 4, then 3^4 + 3^{n+4} = 3^4 + 3^8 = 81 + 6561 = 6642, and the answer is 'no'.

The answer would be fixed soon.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $149 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"
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Re: [Math Revolution] Practice "Math Questions of the Day"   [#permalink] 31 Dec 2018, 09:49
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