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P.S: Bunuel/VeritasPrepKarishma- guys I would request you to provide an explanation on this question.Also, please let me know whether it's a 700+ problem or not? Folks-please come up with your explanations at the same time.

A. –100 < m < 100 B. m ≤ –1 C. m ≤ 1 D. m^2 ≥ 1/4 E. –100 < m < 0

P.S: Bunuel/VeritasPrepKarishma- guys I would request you to provide an explanation on this question.Also, please let me know whether it's a 700+ problem or not? Folks-please come up with your explanations at the same time.

Since m is a negative number, then it must be less than 1.

Answer: C.

Other options:

A. –100 < m < 100 --> if m=-1,000, then this option is not true.

B. m ≤ –1 --> if m=-1/2, then this option is not true.

D. m^2 ≥ 1/4 (m≤-1/2 or m≥1/2) --> if m=-1/4, then this option is not true.

E. –100 < m < 0 --> if m=-1,000, then this option is not true.

P.S. I don't think that it's a 700+ question, more like 600.
_________________

In Option C it says "m less or equal to 1" than if m<0 given in the main condition how does it m<= 1 will always satisfy the condition,

I choose D in doubt as It said m<0 , so my thought process was \(m^2\) will always be positive, but I was not sure if \(m^2 > 1/2\)

what should be the approach in these kind of problems ?

If m is a negative number, then it must be less less than 1.

Consider following: If \(x=5\), then which of the following must be true about \(x\): A. x=3 B. x^2=10 C. x<4 D. |x|=1 E. x>-10

Answer is E (x>-10), because as x=5 then it's more than -10.

Or: If \(-1<x<10\), then which of the following must be true about \(x\): A. x=3 B. x^2=10 C. x<4 D. |x|=1 E. x<120

Again answer is E, because ANY \(x\) from \(-1<x<10\) will be less than 120 so it's always true about the number from this range to say that it's less than 120.
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Re: If m<0, which of the following must be true? [#permalink]

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12 Jun 2013, 17:34

Bunuel wrote:

debayan222 wrote:

If m<0, which of the following must be true?

A. –100 < m < 100 B. m ≤ –1 C. m ≤ 1 D. m^2 ≥ 1/4 E. –100 < m < 0

P.S: Bunuel/VeritasPrepKarishma- guys I would request you to provide an explanation on this question.Also, please let me know whether it's a 700+ problem or not? Folks-please come up with your explanations at the same time.

Since m is a negative number, then it must be less than 1.

Answer: C.

Other options:

A. –100 < m < 100 --> if m=-1,000, then this option is not true.

B. m ≤ –1 --> if m=-1/2, then this option is not true.

D. m^2 ≥ 1/4 (m≤-1/2 or m≥1/2) --> if m=-1/4, then this option is not true.

E. –100 < m < 0 --> if m=-1,000, then this option is not true.

P.S. I don't think that it's a 700+ question, more like 600.

The only reason I did not select option C was because it says "m ≤ 1 " which also includes a possibility of m=1 but when the question states that m=0 how can this be valid? Is it that we have selected option C because the possible values of m would be a sub set of the larger set (m ≤ 1 ) ?

A. –100 < m < 100 B. m ≤ –1 C. m ≤ 1 D. m^2 ≥ 1/4 E. –100 < m < 0

P.S: Bunuel/VeritasPrepKarishma- guys I would request you to provide an explanation on this question.Also, please let me know whether it's a 700+ problem or not? Folks-please come up with your explanations at the same time.

Since m is a negative number, then it must be less than 1.

Answer: C.

Other options:

A. –100 < m < 100 --> if m=-1,000, then this option is not true.

B. m ≤ –1 --> if m=-1/2, then this option is not true.

D. m^2 ≥ 1/4 (m≤-1/2 or m≥1/2) --> if m=-1/4, then this option is not true.

E. –100 < m < 0 --> if m=-1,000, then this option is not true.

P.S. I don't think that it's a 700+ question, more like 600.

The only reason I did not select option C was because it says "m ≤ 1 " which also includes a possibility of m=1 but when the question states that m=0 how can this be valid? Is it that we have selected option C because the possible values of m would be a sub set of the larger set (m ≤ 1 ) ?

Yes, possible value of m (negative numbers) are a subset of the larger set (m ≤ 1 ).

Re: If m<0, which of the following must be true? [#permalink]

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29 Aug 2014, 12:08

In addition to Bunuel's reply

It helps to ask the question ( keeping in mind m is negative) Will all negative numbers lie in the range 100<m<0 --No Will all negative numbers <=-1 -- No Will all negative numbers <= 1 -- Yes Will all negative numbers lie between -100 and 100 -- No For all negative numbers will m^2 >= 1/4 -- No

What an odd problem. It's basically testing to see if you think that we know something about the absolute value of m (we don't). I suppose this gets tricky if you interpret the question as "Which of these could be the range of possible values of m?" because then B, D, & E all look good, and C looks impossible. Once you realize that m doesn't have to fit every value in the range, the problem becomes much easier. It's kind of like saying that if someone is younger than 18, they must also be younger than 100. Definitely true . . .
_________________

Dmitry Farber | Manhattan GMAT Instructor | New York

This question is worded in a 'quirky' way. We're looking for an answer that will ALWAYS be true given the limitations that we have.

The prompt tells us just one thing about M.....M < 0, so M is negative.

The question asks which of the following MUST be true. By definition, EVERY negative number is less than or equal to 1. Technically-speaking, any positive number can be substituted in for "1" and this statement will still ALWAYS be true.

I think some of you are assuming that m is an integer. As Bunuel pointed out, if m is between 0 and -1 (say, -1/2), then B will not be true. However, no matter what negative value we assign to m, it will always be less than 1. C would be correct even if it said "m ≤ 1,000,000." Yep, all negative numbers are less than 1,000,000.
_________________

Dmitry Farber | Manhattan GMAT Instructor | New York

Re: If m<0, which of the following must be true? [#permalink]

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08 May 2015, 00:38

1

This post received KUDOS

DmitryFarber wrote:

I think some of you are assuming that m is an integer. As Bunuel pointed out, if m is between 0 and -1 (say, -1/2), then B will not be true. However, no matter what negative value we assign to m, it will always be less than 1. C would be correct even if it said "m ≤ 1,000,000." Yep, all negative numbers are less than 1,000,000.

I am not able to understand...I considered integers too.. what if m=.5(m<=1) then m has to be negative and .5 is not negative. please help!

Careful, ssriva2, you are reasoning backwards. The fact here is that m<0, so it is definitely negative. Can m be .5? No. But must it be less than 1? Yes! All negative numbers are less than one, even though not all numbers less than one are negative.

Consider an analogy: I am shorter than the Eiffel Tower. Am I shorter than Mount Everest? Yes, of course! True, there are things shorter than Everest that are taller than the Eiffel Tower, but based on the facts provided, I am not one of them!
_________________

Dmitry Farber | Manhattan GMAT Instructor | New York

m is a negative number. A. –100 < m < 100 m can be a negative number less than -100 B. m ≤ –1 m can be a fraction, in which case it would be greater than -1 C. m ≤ 1 must be true since 1 is positive and m is negative D. m^2 ≥ 1/4not true if m is a negative fraction like -1/5 E. –100 < m < 0 m can be a negative number less than -100 _________________

Re: If m<0, which of the following must be true? [#permalink]

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22 Feb 2017, 00:34

Bunuel wrote:

goodyear2013 wrote:

If m<0, which of the following must be true?

A. –100 < m < 100 B. m ≤ –1 C. m ≤ 1 D. m^2 ≥ 1/4 E. –100 < m < 0

Apply the same logic as we used for this question.

All we know is that m is some negative number. We can see that C must be true: if m is negative then it MUST be true that it's less than 1.

Answer: C.

Because of m is a number between -1 and 0, then B won't be true.[/quote] Hi Bunuel, Question stem says: m<0, that means m is always negative. So, how do you consider '''m is a number between -1 and 0'''? Thank you...
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“The heights by great men reached and kept were not attained in sudden flight but, they while their companions slept, they were toiling upwards in the night.” ― Henry Wadsworth Longfellow