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Avinash1Chatur
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Panther2596
I’m just substituting ac with b and the result would be b^3=b^3
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if you substitute ac=b,it means it is always the case because question asks what *must* be true. ac can be equal to b, but it’s not must. Suppose ac=1 and b=0, it satisfies the above condition, but ac is not equal to b
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Panther2596
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Thanks guys, it’s clear now
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vIenSkYB
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Originally posted by vIenSkYB on 24 May 2021, 11:50.
Last edited by vIenSkYB on 24 May 2021, 11:51, edited 1 time in total.
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Avinash1Chatur
if you substitute ac=b,it means it is always the case because question asks what *must* be true. ac can be equal to b, but it’s not must. Suppose ac=1 and b=0, it satisfies the above condition, but ac is not equal to b
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Thank you. Justified.

Thank you all for clearing the doubt.
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Hello Everyone, has anyone given the GMAT exam & scored a Q49-Q51 I just wanted to know how difficult are the difficult questions for quants. I have the E-gmat portal and was skimming through the quant section and the difficult questions seemed pretty daunting and very time consuming. Is that the case in actual GMAT as well ?
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Srishtidiwan
Hello Everyone, has anyone given the GMAT exam & scored a Q49-Q51 I just wanted to know how difficult are the difficult questions for quants. I have the E-gmat portal and was skimming through the quant section and the difficult questions seemed pretty daunting and very time consuming. Is that the case in actual GMAT as well ?
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I also found it difficult and confusing. Sometimes, it seems the question could be solved differently in easier way. I assume my basic is poor.
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Nishant760
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Originally posted by Nishant760 on 26 May 2021, 00:40.
Last edited by Nishant760 on 26 May 2021, 00:43, edited 2 times in total.
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Can anyone explain this with accurate method

Q3. How many different positive integers are factors of 441 ? *
0/1
A. 4
B. 6
C. 7
D.9

E.11

I did understand 3^2 7^2 and then 2+1 2+1
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vIenSkYB
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Nishant760
I did understand 3^2 7^2 and then 2+1 2+1
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this is the formula for finding total number of factors if a^n and b^m are the factors then the formula for finding total number of factors would be (n+1)*(m+1)
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Nishant760
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How to use it ?
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vIenSkYB
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Use it as in ?? The prime factors of 441 are 3*3*7*7 which 3^2 *7^2 from the above forumula of finding total factors (2+1) * (2+1) that would be 9. So total factors of 441 are 9
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anton123
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Originally posted by anton123 on 26 May 2021, 03:08.
Last edited by anton123 on 26 May 2021, 03:12, edited 2 times in total.
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Nishant760
How to use it ?
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oops, sorry, I sent a picture with the formula so you can better understand it but the file is probably too big

but you can see it here for example: https://www.amansmathsblogs.com/factor- ... ny-number/ (skip the text and go directly to the middle of the page where you’ll see big red rectangle
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Hi,
I am looking for study buddy. I want appear for GMAT in Sep. My location is West Bengal, India. Ping me if someone is willing to join. :)

Posted from my mobile device
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If it is true that -6 -8
4. -10 < n < 7
5. none of the above
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The question is a MUST be true and not a COULD be true. So go for the answer choice which will always be true and not partly true

1) n -8, every number that comes in the range given above will be greater than -8 so that’s our answer.
4) this is a common trap answer, here you’ve basically switched signs i.e multiplied it by -1, but we didn’t change the value of n here, it’s hould have become -1, we also didn’t add the equal to sign. So here value of n can be something like -9,-8, -7 which do not come within the range given in the question. So this is also wrong.
5) as we can see, we already have the answer as option 3

ANSWER: option (3)
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vIenSkYB
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avichalchopra
The question is a MUST be true and not a COULD be true. So go for the answer choice which will always be true and not partly true

1) n -8, every number that comes in the range given above will be greater than -8 so that’s our answer.
4) this is a common trap answer, here you’ve basically switched signs i.e multiplied it by -1, but we didn’t change the value of n here, it’s hould have become -1, we also didn’t add the equal to sign. So here value of n can be something like -9,-8, -7 which do not come within the range given in the question. So this is also wrong.
5) as we can see, we already have the answer as option 3

ANSWER: option (3)
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I got trapped with n=-6 . Now it’s clear

Thank you for the clarification.

avichalchopra
The question is a MUST be true and not a COULD be true. So go for the answer choice which will always be true and not partly true

1) n -8, every number that comes in the range given above will be greater than -8 so that’s our answer.
4) this is a common trap answer, here you’ve basically switched signs i.e multiplied it by -1, but we didn’t change the value of n here, it’s hould have become -1, we also didn’t add the equal to sign. So here value of n can be something like -9,-8, -7 which do not come within the range given in the question. So this is also wrong.
5) as we can see, we already have the answer as option 3

ANSWER: option (3)
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thank you 🙂
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mrhrhasibbd
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Originally posted by mrhrhasibbd on 26 May 2021, 07:41.
Last edited by mrhrhasibbd on 26 May 2021, 07:49, edited 3 times in total.
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Hey,

Hey

I’m Hasib from Bangladesh. Join here as a beginner, need a virtual friend in our region or other area...

please response any one interested..
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Nishant760
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vIenSkYB
Use it as in ?? The prime factors of 441 are 3*3*7*7
which 3^2 *7^2 from the above
forumula of finding total factors (2+1) * (2+1) that would be 9. So total factors of 441 are 9
Show more


I still didn’t understood how 2 came and how to use it in formula
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Panther2596
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https://byjus.com/maths/factors-of-a-nu ... ext=(c%2B1)-,Sum%20of%20Factors,%2D1)%2FZ%2D1%5D
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vIenSkYB
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Nishant760
vIenSkYB
Use it as in ?? The prime factors of 441 are 3*3*7*7
which 3^2 *7^2 from the above
forumula of finding total factors (2+1) * (2+1) that would be 9. So total factors of 441 are 9


I still didn’t understood how 2 came and how to use it in formula
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write down factors of 441 i.e 3*3*7*7 which can also be written as 3 square into 7 square that’s where 2 came bro
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Panther2596
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Refer to this link for a better understanding of the concept.. after referring to this you will be able to easily understand the reason for 2
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vIenSkYB
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I.e 3 raised to the power 2 and 7 raised to the power 2
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