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

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Math Revolution GMAT Instructor
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Joined: 16 Aug 2015
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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 10 Oct 2018, 00:25
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.

Attachment:
Math Revolution Questions.png
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Please Click the link for solutions.
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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
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Re: [Math Revolution] Practice "Math Questions of the Day"  [#permalink]

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New post 10 Oct 2018, 09:33
At the solution of Q2............ out of 89,90 & 91 ..... there is only 1 Prime ( not 2)
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Please let me know if I am going in wrong direction.
Thanks in appreciation.

Math Revolution GMAT Instructor
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Joined: 16 Aug 2015
Posts: 6985
GMAT 1: 760 Q51 V42
GPA: 3.82
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Re: [Math Revolution] Practice "Math Questions of the Day"  [#permalink]

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New post 12 Oct 2018, 10:53
u1983 wrote:
At the solution of Q2............ out of 89,90 & 91 ..... there is only 1 Prime ( not 2)


Oh. You're right.
There was a mistake in the condition 2).
It should be fixed in the following way.

Condition 2) : The least number of the integers is a prime number.

Sorry about the confusion.
_________________

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]

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New post 12 Oct 2018, 11:53
MathRevolution wrote:
u1983 wrote:
At the solution of Q2............ out of 89,90 & 91 ..... there is only 1 Prime ( not 2)


Oh. You're right.
There was a mistake in the condition 2).
It should be fixed in the following way.

Condition 2) : The least number of the integers is a prime number.

Sorry about the confusion.


In Q2. S2. we can take 59,60,61. 59 and 61 are prime. So is 29 and 31 (If we take 29,30,31). Hence B is insufficent
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Re: [Math Revolution] Practice "Math Questions of the Day"   [#permalink] 12 Oct 2018, 11:53
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