Quant Question of the Day Chat

Let say she chooses random number 866.
And if you multiple it 100, the ans is 86600 ( which also has 3 digits)

Good through the ques ". The answer also has three digits"

*Go

She can also choose 122, 221, 166 and many others so the answer is not unique. And hence I said that without any other information, the question doesn’t make sense

Yes, question should have option to choose the correct one.

Only with the given information you cannot confirm the correct ans

I only tried to solve as per info that ...the ans could be any 3 digits number

Between 100 and 999

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total probability is 20C1 and 19C1 and favourable probability is 5C1 and 4C1. so answer is 1/19

Really struggling with number system.

Done with basics. Struggling with questions.

Any source of practising good questions for concept clarity .

Gmat club questions bank is huge .. unable to filter the right questions.

Please do help . Really stressed

Filter 500-600 and choose source OG, maths rev, manhattan .

2. Properties of Integers

• Theory
  Math: Number Theory
  Number Properties: Tips and hints
  Advanced Number Properties on GMAT (All 5 parts)
  Do you make these 3 mistakes in GMAT Even-Odd Questions?
  Everything about Factorials on the GMAT
  Solving Complex Problems Using Number Line
  
  • Questions
    Tough New Set: Number Properties Set
    Power of a Number in a Factorial Problems
    Number Properties Ability Quiz
    Special Numbers and Sequences Problems
    The E-GMAT Number Properties Knockout: 10 Great 700+ Ques for you!
    Trailing Zeros Problems
    DS Questions
    PS Questions

For other subjects:
ALL YOU NEED FOR QUANT ! ! !
Ultimate GMAT Quantitative Megathread

Hope it helps.­

Hi,
I was practicing the gmat flashcards available on gmatclub.
gmat-flashcards-108651.html
On page 28, if you see the solution, it says sqrt(x-3)^2 is (3-x).

How is that possible

Can you post the question here pls?

If you read the next point carefully, you will get your answer.

­
If each expression under the square root is greater than or equal to 0, what is \(\sqrt{x^2 - 6x + 9} + \sqrt{2 - x} + x - 3\)?

A. \(\sqrt{2 - x}\)
B. \(2x - 6 + \sqrt{2 - x}\)
C. \(\sqrt{2 - x} + x - 3\)
D. \(2x - 6 + \sqrt{x - 2}\)
E. \(x + \sqrt{x - 2}\)

Absolute Value Properties:

When \(x \le 0\), then \(|x|=-x\), or more generally, when \(\text{some expression} \le 0\), then \(|\text{some expression}| = -(\text{some expression})\).

When \(x \ge 0\), then \(|x|=x\), or more generally, when \(\text{some expression} \ge 0\), then \(|\text{some expression}| = \text{some expression}\).

Another important property to remember is \(\sqrt{x^2}=|x|\).

Back to the Original Question:

\(\sqrt{x^2 - 6x + 9} + \sqrt{2 - x} + x - 3=\)

\(=\sqrt{(x-3)^2}+\sqrt{2-x}+x-3=\)

\(=|x-3|+\sqrt{2-x}+x-3\).

Now, since the expressions under the square roots are greater than or equal to zero, then \(2-x \ge 0\), which implies \(x \le 2\). Next, since \(x \le 2\), the expression \(x-3\) inside the absolute value is negative. Therefore, \(|x-3|=-(x-3)=-x+3\). This allows us to rewrite the above expression as follows:

\(|x-3|+\sqrt{2-x}+x-3=\)

\(=-x+3+\sqrt{2-x}+x-3=\)

\(=\sqrt{2-x}\).

Answer: A­­­­

You can find a detailed discussion of this question here:

https://gmatclub.com/forum/if-each-expr ... 87153.html­

is there any similiar group for CR and RC ?

 
­
Check Verbal chat here: 

https://gmatclub.com/forum/mchat.php?room_id=50050617

Check DI chat here: 

https://gmatclub.com/forum/mchat.php?room_id=50050723

Hope it helps.

Thanks a lot Bunuel !­

Hey mates, I’ve my first GMAT test Friday, and I’m really worried about one thing but I ca’t find a definitive answer. For the test (especially for the quant section), we just have the board in the computer with the test (awful design) or we have in addition a sheet and a pen??? Tell me the truth even if I’m expecting that your answer is the one that I want haha.

If you are giving the test at centre then, a booklet/sheet with 2 markers will be provided to you