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# Quant Question of the Day Chat

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Re: Quant Question of the Day Chat [#permalink]
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
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Re: Quant Question of the Day Chat [#permalink]
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
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Re: Quant Question of the Day Chat [#permalink]
Arya_S wrote:
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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Re: Quant Question of the Day Chat [#permalink]
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Re: Quant Question of the Day Chat [#permalink]
Illusion2919 wrote:
If 5 integers are to be selected at random and without replacement from the list consisting of the 20 integers from 1 to 20, inclusive, what is the probability that 2 of the 5 selected integers will be 10 and 20 ? A. 2/5 B. 1/4 C. 1/10 D. 1/19 E. 1/60

total probability is 20C1 and 19C1 and favourable probability is 5C1 and 4C1. so answer is 1/19
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Re: Quant Question of the Day Chat [#permalink]
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
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Re: Quant Question of the Day Chat [#permalink]
Anirban_iimisb wrote:
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.

Filter 500-600 and choose source OG, maths rev, manhattan .
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Re: Quant Question of the Day Chat [#permalink]
1
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Re: Quant Question of the Day Chat [#permalink]
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
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Re: Quant Question of the Day Chat [#permalink]
Gprabhumir wrote:
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).

Can you post the question here pls?
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Re: Quant Question of the Day Chat [#permalink]
Gprabhumir wrote:
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).

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Re: Quant Question of the Day Chat [#permalink]
1
Bookmarks
Gprabhumir wrote:
Hi,
I was practicing the gmat flashcards available on gmatclub.
https://gmatclub.com/forum/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

­
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:

$$|x-3|+\sqrt{2-x}+x-3=$$

$$=-x+3+\sqrt{2-x}+x-3=$$

$$=\sqrt{2-x}$$.

You can find a detailed discussion of this question here:

https://gmatclub.com/forum/if-each-expr ... 87153.html­
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Re: Quant Question of the Day Chat [#permalink]
is there any similiar group for CR and RC ?
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Re: Quant Question of the Day Chat [#permalink]

SnorLax_7 wrote:
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.
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Re: Quant Question of the Day Chat [#permalink]
Thanks a lot Bunuel
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Re: Quant Question of the Day Chat [#permalink]
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.
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Re: Quant Question of the Day Chat [#permalink]
Iwen wrote:
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
Re: Quant Question of the Day Chat [#permalink]
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