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# If m, p, s and v are positive, and m/p<s/v, which of the fol

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If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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22 Sep 2013, 07:29
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If m, p, s and v are positive, and $$\frac{m}{p} <\frac{s}{v}$$, which of the following must be between $$\frac{m}{p}$$ and $$\frac{s}{v}$$

I. $$\frac{m+s}{p+v}$$
II. $$\frac{ms}{pv}$$
III. $$\frac{s}{v} - \frac{m}{p}$$

A. None
B. I only
C. II only
D. III only
E. I and II both
[Reveal] Spoiler: OA

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Last edited by Bunuel on 22 Sep 2013, 07:36, edited 2 times in total.
Renamed the topic, edited the question and moved to PS forum.

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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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22 Sep 2013, 08:31
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imhimanshu wrote:
If m, p, s and v are positive, and $$\frac{m}{p} <\frac{s}{v}$$, which of the following must be between $$\frac{m}{p}$$ and $$\frac{s}{v}$$

I. $$\frac{m+s}{p+v}$$
II. $$\frac{ms}{pv}$$
III. $$\frac{s}{v} - \frac{m}{p}$$

A. None
B. I only
C. II only
D. III only
E. I and II both

Given that $$\frac{m}{p}<\frac{s}{v} \to \frac{m}{s}<\frac{p}{v}$$Adding 1 on both sides we have $$\frac{m+s}{s}<\frac{p+v}{v} \to \frac{m+s}{p+v}<\frac{s}{v}$$

Again,$$\frac{m}{p}<\frac{s}{v} \to \frac{v}{p}<\frac{s}{m}$$ Adding 1 on both sides, we have $$\frac{v+p}{p}<\frac{s+m}{m} \to \frac{m}{p}<\frac{s+m}{v+p}$$ . Thus, I is always true. We just have to check for Option II now.

Assming it to be true, we should have$$\frac{ms}{pv}<\frac{s}{v} \to \frac{m}{p}<1$$ Which is not always true. Thus the answer is B.
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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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22 Sep 2013, 11:47
How can I solve this using numbers?
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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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23 Sep 2013, 01:37
igotthis wrote:
How can I solve this using numbers?

You can take numbers such 1,2,3 and 4 as m,p,s and v
find the value between m/p and s/v
try to enter the numbers in the answer choices.
only option B will satisfy .

Thanks
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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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24 Sep 2013, 02:53
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imhimanshu wrote:
If m, p, s and v are positive, and $$\frac{m}{p} <\frac{s}{v}$$, which of the following must be between $$\frac{m}{p}$$ and $$\frac{s}{v}$$

I. $$\frac{m+s}{p+v}$$
II. $$\frac{ms}{pv}$$
III. $$\frac{s}{v} - \frac{m}{p}$$

A. None
B. I only
C. II only
D. III only
E. I and II both

Responding to a pm:

You can work on this question using some number line and averaging concepts.
Let's look at statement II and III first since they are very easy.

We know $$\frac{m}{p} <\frac{s}{v}$$

On the number line: .............0....................m/p ........................s/v (since m, p, s and v are all positive so m/p and s/v are to the right of 0)

II. $$\frac{ms}{pv}$$
Think of the case when m/p and s/v are both less than 1. When you multiply them, they will become even smaller. Say .2*.3 = .06. So the product may not lie between them.

III. $$\frac{s}{v} - \frac{m}{p}$$
Think of a case such as this: .............0..............................m/p .......s/v
$$\frac{s}{v} - \frac{m}{p}$$ will be much smaller than both m/p and s/v and will lie somewhere here:
.............0.......Here...........................m/p .......s/v
So it needn't be between them.

Now only issue is (I). You can check some numbers for it including fractions and non fractions. Or try to understand it using number line.
Think of 4 numbers as N1, N2, D1, D2 for ease and given fractions as N1/D1 and N2/D2.

$$\frac{m+s}{p+v} = \frac{m+s/2}{p+v/2}$$ = (Avg of N1 and N2)/(Avg of D1 and D2)

Now numerator of avg will lie between N1 and N2 and denominator of avg will lie between D1 and D2. So Avg N/Avg D will lie between N1/D1 and N2/D2. Try to think this through.

If N1/D1 < N2/D2, it could be because N1 < N2 and D1 = D2. So AvgN will lie between N1 and N2 and AvgD = D1 = D2. It could also be because N1 < N2 and D1 > D2. AvgN will be larger than N1 but smaller than N2. AvgD will be smaller than D1 but greater than D2 so AvgN/AvgD will be greater than N1/D1 but smaller than N2/D2. It could also be because N1 << N2 and D1 < D2 i.e. N1 is much smaller than N2 as compared to D1 to D2.
It could be because N1=N2 but D1>D2. Again, AvgD will lie between D1 and D2 and AvgN = N1 = N2.
It could also be because N1 > N2 but D1 >> D2.
Take some numbers to understand why this makes sense.
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Kudos [?]: 16925 [13], given: 230 Intern Joined: 11 Jun 2012 Posts: 10 Kudos [?]: 7 [1], given: 6 Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink] ### Show Tags 19 Nov 2013, 01:08 1 This post received KUDOS rahultripathi2005 wrote: igotthis wrote: How can I solve this using numbers? You can take numbers such 1,2,3 and 4 as m,p,s and v find the value between m/p and s/v try to enter the numbers in the answer choices. only option B will satisfy . Thanks Rahul Hi, I make the plug in as follows but it does not work: 1/2 < 3/4 1. (1+3)/(2+4) = 4/6 = 2/3 so in between 2. (1*3)/(2*4) = 3/8 less than 1/2 3. (3-1)/(4-2) = 1 > 3/4 So this problem cannot solve by using plugin?? Please help to correct me if I went wrong. Thanks! Kudos [?]: 7 [1], given: 6 Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7615 Kudos [?]: 16925 [1], given: 230 Location: Pune, India Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink] ### Show Tags 19 Nov 2013, 20:56 1 This post received KUDOS Expert's post 1 This post was BOOKMARKED Cee0612 wrote: I make the plug in as follows but it does not work: 1/2 < 3/4 1. (1+3)/(2+4) = 4/6 = 2/3 so in between 2. (1*3)/(2*4) = 3/8 less than 1/2 3. (3-1)/(4-2) = 1 > 3/4 So this problem cannot solve by using plugin?? Please help to correct me if I went wrong. Thanks! Statement 3 is (s/v) - (m/p) When you take values as 1, 2, 3 and 4, it becomes (3/4) - (1/2) = 1/4 (This is not between 1/2 and 3/4 and hence you know that statement 3 may not hold always) Plugging in numbers is not the best strategy for 'must be true' questions. You know that statement 1 holds for these particular values of m , p, s and v (1, 2, 3 and 4) but how do you know that it will be true for every set of valid values of m, p, s and v? You cannot try every set. You can certainly ignore statements II and III since you have already got values for which they are not satisfied. But you must focus more on statement I and try to figure out using logic whether it must always hold. _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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26 Feb 2014, 13:00
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This is one of those very few problems were picking numbers is almost your only weapon

Let's say that m/p<s/v,

Let's say m=4, p=2, s=3 and v=1

So let's begin with statements

I. 4+3/3=7/3=2.3 is it between 2<x<3?

Yes, so this one is true

2. Clearly not true
3. Clearly not true

Therefore only I is our best answer choice

Hope this helps
Cheers
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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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26 Feb 2014, 19:03
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imhimanshu wrote:
If m, p, s and v are positive, and $$\frac{m}{p} <\frac{s}{v}$$, which of the following must be between $$\frac{m}{p}$$ and $$\frac{s}{v}$$

I. $$\frac{m+s}{p+v}$$
II. $$\frac{ms}{pv}$$
III. $$\frac{s}{v} - \frac{m}{p}$$

A. None
B. I only
C. II only
D. III only
E. I and II both

for these kind of problems, I feel it is better to keep as close as possible so that we can be confident with every option

I chose 3,4,4,5 so that 3/4<4/5 (i.e. 0.75<0.8)

I=> (3+4)/(4+5) = 7/9 = 0.77 satisfies
II=>12/20=>3/5=0.6 incorrect
III=>4/5 - 3/4 = 0.8 - 0.75= 0.05

only I is correct.

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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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01 Mar 2014, 06:28
which of the following 'must be' between m/p and s/v?

I didn't understand the question. What does the question mean here by 'must be'?

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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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01 Mar 2014, 07:16
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siriusblack1106 wrote:
which of the following 'must be' between m/p and s/v?

I didn't understand the question. What does the question mean here by 'must be'?

"Must be" means for any (possible) values of m, p, s and v. So, $$\frac{m}{p}< (option) <\frac{s}{v}$$, must hold true fo any positive values of m, p, s and v.

Must or Could be True Questions to practice: search.php?search_id=tag&tag_id=193

Hope it helps.
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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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05 Apr 2014, 10:45
Bunuel wrote:
siriusblack1106 wrote:
which of the following 'must be' between m/p and s/v?

I didn't understand the question. What does the question mean here by 'must be'?

"Must be" means for any (possible) values of m, p, s and v. So, $$\frac{m}{p}< (option) <\frac{s}{v}$$, must hold true fo any positive values of m, p, s and v.

Must or Could be True Questions to practice: search.php?search_id=tag&tag_id=193

Hope it helps.

Bunuel can you please explain why option 1 must be true? I dont get it. Thanks in advance

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m, p, s, and v are positive and m/p < s/v [#permalink]

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17 May 2014, 10:51
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If $$m$$, $$p$$, $$s$$, and $$v$$ are positive and $$\frac{m}{p}$$ $$<$$ $$\frac{s}{v}$$, which of the following must be between $$\frac{m}{p}$$ and $$\frac{s}{v}$$?

1 - $$\frac{m+s}{p+v}$$

2 - $$\frac{ms}{pv}$$

3 - $$\frac{s}{v} - \frac{m}{p}$$

A - None
B - 1 only
C - 2 only
D - 3 only
E - 1 & 2

Last edited by dxx on 17 May 2014, 11:38, edited 2 times in total.

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Re: m, p, s, and v are positive and m/p < s/v [#permalink]

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17 May 2014, 10:52
I couldn't get my head around this one, so I used numbers:

$$\frac{m}{p}$$ = $$\frac{1}{2}$$ and $$\frac{s}{v}$$ = $$\frac{3}{4}$$

This fulfils the condition that $$\frac{m}{p}$$ $$<$$ $$\frac{s}{v}$$

Now,

$$\frac{m+s}{p+v}$$ is $$\frac{1+3}{2+4}$$ $$=$$$$\frac{4}{6}$$ $$=$$$$\frac{2}{3}$$, so sufficient as it is between $$\frac{1}{2}$$ and $$\frac{3}{4}$$.

$$\frac{ms}{pv}$$ is $$\frac{1*3}{2*4} = \frac{3}{8}$$, which is less than $$\frac{1}{2}$$, so not sufficient

$$\frac{s}{v} - \frac{m}{p}$$ is $$\frac{3}{4}-\frac{1}{2} = \frac{1}{4}$$, which is less than $$\frac{1}{2}$$, so not sufficient

Is this approach suitable for such questions? Both in terms of accuracy and time: is this valid solution valid for all fractions and is there a faster way to solve this?

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Re: m, p, s, and v are positive and m/p < s/v [#permalink]

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18 May 2014, 00:52
dhirajx wrote:
If $$m$$, $$p$$, $$s$$, and $$v$$ are positive and $$\frac{m}{p}$$ $$<$$ $$\frac{s}{v}$$, which of the following must be between $$\frac{m}{p}$$ and $$\frac{s}{v}$$?

1 - $$\frac{m+s}{p+v}$$

2 - $$\frac{ms}{pv}$$

3 - $$\frac{s}{v} - \frac{m}{p}$$

A - None
B - 1 only
C - 2 only
D - 3 only
E - 1 & 2

Merging similar topics. Please refer to the discussion above.
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Re: m, p, s, and v are positive and m/p < s/v [#permalink]

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18 May 2014, 00:53
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dhirajx wrote:
I couldn't get my head around this one, so I used numbers:

$$\frac{m}{p}$$ = $$\frac{1}{2}$$ and $$\frac{s}{v}$$ = $$\frac{3}{4}$$

This fulfils the condition that $$\frac{m}{p}$$ $$<$$ $$\frac{s}{v}$$

Now,

$$\frac{m+s}{p+v}$$ is $$\frac{1+3}{2+4}$$ $$=$$$$\frac{4}{6}$$ $$=$$$$\frac{2}{3}$$, so sufficient as it is between $$\frac{1}{2}$$ and $$\frac{3}{4}$$.

$$\frac{ms}{pv}$$ is $$\frac{1*3}{2*4} = \frac{3}{8}$$, which is less than $$\frac{1}{2}$$, so not sufficient

$$\frac{s}{v} - \frac{m}{p}$$ is $$\frac{3}{4}-\frac{1}{2} = \frac{1}{4}$$, which is less than $$\frac{1}{2}$$, so not sufficient

Is this approach suitable for such questions? Both in terms of accuracy and time: is this valid solution valid for all fractions and is there a faster way to solve this?

Check here: if-m-p-s-and-v-are-positive-and-m-p-s-v-which-of-the-fol-160298.html#p1294731

Hope it helps.
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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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23 Apr 2015, 15:25
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mau5 wrote:
imhimanshu wrote:
If m, p, s and v are positive, and $$\frac{m}{p} <\frac{s}{v}$$, which of the following must be between $$\frac{m}{p}$$ and $$\frac{s}{v}$$

I. $$\frac{m+s}{p+v}$$
II. $$\frac{ms}{pv}$$
III. $$\frac{s}{v} - \frac{m}{p}$$

A. None
B. I only
C. II only
D. III only
E. I and II both

Given that $$\frac{m}{p}<\frac{s}{v} \to \frac{m}{s}<\frac{p}{v}$$Adding 1 on both sides we have $$\frac{m+s}{s}<\frac{p+v}{v} \to \frac{m+s}{p+v}<\frac{s}{v}$$

Again,$$\frac{m}{p}<\frac{s}{v} \to \frac{v}{p}<\frac{s}{m}$$ Adding 1 on both sides, we have $$\frac{v+p}{p}<\frac{s+m}{m} \to \frac{m}{p}<\frac{s+m}{v+p}$$ . Thus, I is always true. We just have to check for Option II now.

Assming it to be true, we should have$$\frac{ms}{pv}<\frac{s}{v} \to \frac{m}{p}<1$$ Which is not always true. Thus the answer is B.

You have the best approach in this thread, but I would never have thought of your solution to #1. I think you made it more complicated than it needed to be.

This is actually a very easy problem once you spend a few moments understanding what you need to do.

You're told the following:
1) m, p, s and v are positive
2) $$\frac{m}{p} <\frac{s}{v}$$

So, you need to know whether each option is both less than $$\frac{s}{v}$$ and greater than $$\frac{m}{p}$$. That's it. Once that clicks, it's very easy.

I. $$\frac{m+s}{p+v}$$

So part A:

Is $$\frac{m+s}{p+v} < \frac{s}{v}$$ ?
Is $$mv+sv < sp + sv$$ ?
Is $$mv < sp$$ ?
Hmmm, that looks familar. In fact, it's the second thing they gave us: $$\frac{m}{p} <\frac{s}{v}$$.
So yes!

Part B:

Is $$\frac{m+s}{p+v} > \frac{m}{p}$$ ?
Is $$mp+sp > mp + mv$$ ?
Is $$sp > mv$$ ?
Hmmm, that looks familar too. In fact, it's also the second thing they gave us: $$\frac{m}{p} <\frac{s}{v}$$.
So yes!

Then you perform the same (quicker) process for II.

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If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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21 Jun 2015, 11:13
Hi guys,

I got this problem on an exam pack 1 CAT and failed to solve it correctly due to a technical error (DRIVING ME CRAZY). Otherwise I picked numbers and was 99% on the right path. One question I have for you is:

Do you think testing one pari of numbers is enough? I picked 2 pairs:
- m=1, p=3, s=3 and v=4
- m=3, p=1, s=4 and v=1

These 2 options are more conservative as I wanted to test these equations for fractions and integers. Do you think this was overkill (question stem says we're talking about positive numbers and not integers)? As far as I can see, all of you tested just one pair of numbers, which of course almost certainly decreases the time needed to solve the problem.

Thanks!
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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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21 Jun 2015, 21:42
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bgpower wrote:
Hi guys,

I got this problem on an exam pack 1 CAT and failed to solve it correctly due to a technical error (DRIVING ME CRAZY). Otherwise I picked numbers and was 99% on the right path. One question I have for you is:

Do you think testing one pari of numbers is enough? I picked 2 pairs:
- m=1, p=3, s=3 and v=4
- m=3, p=1, s=4 and v=1

These 2 options are more conservative as I wanted to test these equations for fractions and integers. Do you think this was overkill (question stem says we're talking about positive numbers and not integers)? As far as I can see, all of you tested just one pair of numbers, which of course almost certainly decreases the time needed to solve the problem.

Thanks!

Testing numbers for "must be true" doesn't always work. One set of values could help you establish that statements II and III do not hold. But how can you PROVE that statement I will always hold just because it holds for one set of values?
You do need to establish algebraically or logically that it will hold.

Check for algebraic solution: if-m-p-s-and-v-are-positive-and-m-p-s-v-which-of-the-fol-160298.html#p1269854
Check for logical solution: if-m-p-s-and-v-are-positive-and-m-p-s-v-which-of-the-fol-160298.html#p1270389
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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol [#permalink]

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19 Sep 2015, 04:43
imhimanshu wrote:
If m, p, s and v are positive, and $$\frac{m}{p} <\frac{s}{v}$$, which of the following must be between $$\frac{m}{p}$$ and $$\frac{s}{v}$$

I. $$\frac{m+s}{p+v}$$
II. $$\frac{ms}{pv}$$
III. $$\frac{s}{v} - \frac{m}{p}$$

A. None
B. I only
C. II only
D. III only
E. I and II both

I agree with jlgdr, plugging in makes this question a sub 600 question.

Let's say:

$$\frac{m}{p} <\frac{s}{v}$$ = $$\frac{1}{10} <\frac{5}{10}$$

Then I. = 0.3, which is between the two values
Then II. = 0.05, which is not between the two values
Then III. = -0.05, which is not between the two values
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Re: If m, p, s and v are positive, and m/p<s/v, which of the fol   [#permalink] 19 Sep 2015, 04:43

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14 Line L contains the points (2,3) and (p,q). If q = 2, which of the fol 6 19 Jul 2017, 00:54
6 If 375y = x^2, and x and y are positive integers then which of the fol 4 26 May 2017, 20:26
16 If n is a positive integer and k + 2 = 3^n, which of the fol 17 26 Aug 2017, 08:06
1 If r and p are two different prime numbers, which of the fol 2 04 Sep 2013, 03:25
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