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What is the value of x? (1) x = -1, 1 (2) x = 1, 2

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Intern
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Joined: 09 Jun 2018
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What is the value of x? (1) x = -1, 1 (2) x = 1, 2  [#permalink]

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New post Updated on: 10 Jun 2018, 00:15
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

69% (00:23) correct 31% (00:20) wrong based on 33 sessions

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What is the value of x?

(1) x = -1, 1
(2) x = 1, 2

Hi everyone!

I encontered the following basic question and I find hard to agree with, please give thoughts

Answer:
(C); x=1

If I combine the two statement (making it one long staement), don't I get x=-1, 1, 2 and therefore the correct ansert is (E)?

Originally posted by neadhs on 09 Jun 2018, 04:08.
Last edited by Bunuel on 10 Jun 2018, 00:15, edited 1 time in total.
Renamed the topic and edited the question.
Director
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Re: What is the value of x? (1) x = -1, 1 (2) x = 1, 2  [#permalink]

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New post 09 Jun 2018, 06:04
1
neadhs wrote:
Hi everyone!

I encontered the following basic question and I find hard to agree with, please give thoughts

What is the value of x?

(1) x = -1, 1
(2) x = 1, 2

Answer:
(C); x=1

If I combine the two statement (making it one long staement), don't I get x=-1, 1, 2 and therefore the correct ansert is (E)?


In DS problems, while we combine the two statements , we combine st1 and st2 not st1 or st2.

here say set A={-1,1}------------from st1
set B={1,2}------------from st2
Now combining St1 and st2, we have A and B(=common element)
Or, AnB={1}
Since after combining we get one value of x, hence sufficient.

Ans C

P.S:- In case of value sums, we have to consider the common values from both the statements. The common value must satisfy both the statements.

Hope it helps.
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Regards,

PKN

Rise above the storm, you will find the sunshine

Intern
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Joined: 09 Jun 2018
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Re: What is the value of x? (1) x = -1, 1 (2) x = 1, 2  [#permalink]

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New post 09 Jun 2018, 06:19
Yes, it was a little counterintuitive for at first, but now I won't forget.

Thank you very much!
Director
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Re: What is the value of x? (1) x = -1, 1 (2) x = 1, 2  [#permalink]

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New post 19 Jul 2018, 04:27
C has to be answer

As when you combine both statemnets you will get a unique value which is common to both sets.
So thats why C is answer

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Re: What is the value of x? (1) x = -1, 1 (2) x = 1, 2 &nbs [#permalink] 19 Jul 2018, 04:27
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