Solving 700-Level GMAT Number Properties Questions under 2 Minutes | GMAT Quant Prep

In this session, we will tackle questions on Prime numbers. The session will be divided into 3 gradually progressing parts:

Part 1: Concept Recap: Theory Discussion and Feedback on how to solve questions effectively

Part 2: Here, we will solve 600 – level questions using our conceptual foundations.

Part 3: We will discuss 700-750 level questions to build upon the learning we had in Parts 1 and 2 of the session.

In all, we will discuss questions, theory, and smart approaches, all with the goal of teaching you how to methodically tackle difficult GMAT-like Questions on Prime Numbers.

As a bonus, you will get free access to 25+ Video Lessons, 7+ Webinars, and 300 + Questions which you can use for your GMAT Preparation.

Let’s make this better- you will also get access to a Sigma-X Mock, which is by far the closest mock to the real GMAT. This will help you best understand your current level of preparation, leading you one step closer to your desired score.

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[graduatenikamma]

Had you been my teacher in school, you would have been my favorite math teacher

[anshumgulati]

Extremely informative session. Thank you!

[JahangirAlam-kizp]

Very clear presentation and informative. Thanks !

[sevilabilova]

Thank you very much for this session! It was very informative for me - for a person who does not have quantitative background.

[ishanshezad]

brilliant video, looking forward to more chapter wise instructionals like this

[gideonudobong]

Shweta, well done! Thanks for this video - very informative.

[sanskritibisht]

1:06:24 / 1:32:12

Chose A. REMEMBER: DONT ASSUME ANYTHING IN DS. You can't assume that Q is a perfect square!! Q might be 2*3*5 in which case: root Q will be a non integer. AND ONLY INTEGERS HAVE PRIME FACTORS!!. SO WRONG
ii. gives u the missing piece which is that: Q is a perf square.
CORRECT:C

[xxaurxlixnxx]

Thank you really much for this video. Number properties is a real struggle for me, but this video helped me a lot. However I just have a question about question 2 of the second speed-run. Imagine that the first was: 
"K*4 is divisible by 700" 
We would know that 7 was also a prime factors. Would this make the first statement sufficient (or would it be still insufficient because it could still have other primer factors that we don't know) ?
Thank you really much for your help !!

[sharonsapkale]

had a very hard time concentrating because i couldn't take my eyes off shweta ma'am

[PG-jxyh]

Hey, so in Q2 of the warm up session, I know the concept to solve the sum but my question is that while prime factorising, how do I judge if a weird number like 1001 is prime or composite?

[sanskritibisht]

1:15:45 / 1:32:12

CHOSE B. WRONG.
BREAK DOWN Q STEM: 14k= 2*7*K
HOW MANY PRIME FACTORS 14K HAS WILL DEPEND ON K
3 CASES:
a. K HAS ONLY 2 AND 7 AS ITS PRIME FACTORS=> then PF OF K=PF OF 14K
b. K HAS ONLY 2 OR ONLY 7 => PF OF 14K= 1+ PF OF K
c. K HAS NEITHER 2 NOR 7 => PF OF 14K= 2+PF OF K


ii. 50 K ko separate cases lo. 50 K has 2 and 5 factors does NOT imply that K ALSO HAS BOTH!{MY MISTAKE}
50K= 2*5^2 K=> K can have *only 2, only 5 and both 2 and 5 as factors*. =3 CASES. {Thought this was not important}

only2: case b
only5: case c
both: case b

HENCE ANS C

[sayedasamar]

Such an informative session. However can the links be shared here as well for the Quant 2.0 XPERT session regarding process skills, plz?

[salmajahanlipi]

Can I get any note or something on what you've taught in the class? It'd be helpful.

[giacomo]

Hi, I have a doubt on the first 700-level question you solved. I don't think you can say that, because Q^8 has 3 prime factors than Q has 3 prime factors, as well. Indeed, you don't know whether Q is actually an integer or not. If Q^8=2*3*5, which satisfies condition #1, than Q does NOT have 3 prime factors. It's the same reasoning that you apply between Q and sqrt(Q). Am I wrong in my argument ? I'd really need an answer from you to see whether I got the concept right. Thx !!😀

[ammuk]

50k has two different prime factors implies that the two factors will be 5 and 2, no other prime factors is there. Please explain why it is c and not b

[natashalopez]

Similarly, the second 700+ level question is badly written. The second statement, 50K has two different prime factors does NOT mean it has no more than 2 factors. In fact, statement two is a redundant statement because it is obvious that because of 50, 50K will have 2 different prime factors (2 & 5). The statements gives nothing abt the prime factors of K.

[GajananPalande]

Shweta Maam is a Anushka Sharma Look alike

[suchipamarthi]

while we taking the test is their any chance toget a paper for rough work?? using board was quite hard🙃🙃🥲