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24 Mar 2020, 04:26
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Ask me Anything about GMAT Data Sufficiency
Hello and welcome to GMAT preparation. You may know me from GMATBusters' Quant Quiz. I hope you are finding the Quiz very useful.
This topic is a new feature on the DS Forum and a way for you to directly interact with me and ask anything about the DS (even PS
), e.g. if you want a certain concept explained or have a particular you question you want me addressed, this is the place to post a link to it or your question.If you have any doubts/queries about Quant DS (even PS
), I would be happy to address them. - If the question is general in nature regarding strategy or any concept, you can post it here.
- you can tag me in a post to ask queries related to the particular question.
- Participate in the Quiz, we will discuss the Quiz questions in the webinar here.
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Happy Learning!!!
25 Mar 2020, 00:24
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Is \(m*k^4\) > 0?
1) \(m^2-8m+15<0\)
2) \(k^2-6k+8>0\)
1) \(m^2-8m+15<0\)
2) \(k^2-6k+8>0\)
General Discussion
25 Mar 2020, 10:51
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Myth : k^2n is always Positive
Concept:
Concept:
k^2n is always Non Negative
St 1) using wavy curve approach:
(m-3)(m-5)<0
hence 3<m<5
m is always positive. also power of K is even.
k can not be negative, but it can be zero or positive.
if k = 0, \(m*k^4\) = 0
if k is not equal to 0, \(m*k^4\) >0
NOT SUFFICIENT
St 2: (k-2)(k_4)>0
hence, k >4 or k <2
now, k can also be equal to zero.
Also no info about m, so it is not sufficient.
NOT SUFFICIENT
Even after combining St1 &2, we know m >0 but k can be zero or non zero.
hence NOT SUFFICIENT
Answer
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