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Is A + B + C = 0? (1) A = -B (2) B = C

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Is A + B + C = 0? (1) A = -B (2) B = C  [#permalink]

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New post 04 Dec 2018, 03:07
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

71% (01:01) correct 29% (00:47) wrong based on 120 sessions

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Is A + B + C = 0? (1) A = -B (2) B = C  [#permalink]

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New post Updated on: 04 Dec 2018, 03:40
Bunuel wrote:
Is A + B + C = 0?

(1) A = -B
(2) B = C



from1 :
A=-B but no info of C
so -b+b+c=0
c=0 ,
not sufficient

from 2: B=C
A+B+C=0
A+2B=0
combining both wont get us any solution as well
IMO E
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Originally posted by Archit3110 on 04 Dec 2018, 03:32.
Last edited by Archit3110 on 04 Dec 2018, 03:40, edited 1 time in total.
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Re: Is A + B + C = 0? (1) A = -B (2) B = C  [#permalink]

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New post 04 Dec 2018, 03:35
The answer is E.
1) and 2) are obviously insufficient on their own, as each only gives info on two of the three variables.
combining them and representing A and C n terms of B, we get A+B+C = -B+B+B = B. But we don't know if B equals zero or not! insufficient.
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Re: Is A + B + C = 0? (1) A = -B (2) B = C  [#permalink]

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New post 04 Dec 2018, 03:37
Archit3110 wrote:
Bunuel wrote:
Is A + B + C = 0?

(1) A = -B
(2) B = C



from1 :
A=-B but no info of C
so -b+b+c=0
c=0 ,

-b+b+0=o
i think its sufficient

from 2: B=C
A+B+C=0
A+2B=0
not sufficient
IMO A


Archit3110 notice you are solving it as if the equation A + B + C = 0 is a given, but actually - the question is whether this equation is true or not.
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Re: Is A + B + C = 0? (1) A = -B (2) B = C  [#permalink]

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New post 04 Dec 2018, 03:39
DavidTutorexamPAL wrote:
Archit3110 wrote:
Bunuel wrote:
Is A + B + C = 0?

(1) A = -B
(2) B = C



from1 :
A=-B but no info of C
so -b+b+c=0
c=0 ,

-b+b+0=o
i think its sufficient

from 2: B=C
A+B+C=0
A+2B=0
not sufficient
IMO A


Archit3110 notice you are solving it as if the equation A + B + C = 0 is a given, but actually - the question is whether this equation is true or not.


DavidTutorexamPAL :
yeah understood , where i went wrong.. E would be correct in that case ..
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Re: Is A + B + C = 0? (1) A = -B (2) B = C  [#permalink]

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New post 04 Dec 2018, 04:03
Answer should be E.
This is because
1. A=-B
This will give A+B+C as -B+B+C which equals C.Since value of C is not known,we cannot say whether A+B+C equals 0.
Hence insufficient.

2 B=C, doesn't gives any further information on value of C.Hence insufficient.

Combining 1&2,we still can't find the value of C.
Hence insufficient.
So,answer will be E

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Re: Is A + B + C = 0? (1) A = -B (2) B = C  [#permalink]

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New post 04 Dec 2018, 04:31
Bunuel wrote:
Is A + B + C = 0?

(1) A = -B
(2) B = C


From statement 1

- B + B + C = 0?

We have C = 0? We don’t know the value of c so it is insufficient.

Statement 2

B = C

A + 2B = 0? We have 2 variables and 1 equation so insufficient.

Combined statement 1 and 2

A = - B

- B + 2B = 0

We have B = 0? Not sufficient.

Answer choice E

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Re: Is A + B + C = 0? (1) A = -B (2) B = C  [#permalink]

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New post 04 Dec 2018, 11:49
Archit3110 wrote:
Bunuel wrote:
Is A + B + C = 0?

(1) A = -B
(2) B = C



from1 :
A=-B but no info of C
so -b+b+c=0
c=0 ,
not sufficient

from 2: B=C
A+B+C=0
A+2B=0
combining both wont get us any solution as well
IMO E


Hi ,
you got the answer correct however , you cannot assume -b+b+c = 0
This question stem was whether a+b+c = 0 ?
We cannot take a+b+c=0 ! This is no where given .
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Re: Is A + B + C = 0? (1) A = -B (2) B = C  [#permalink]

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New post 24 Dec 2018, 01:30
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Re: Is A + B + C = 0? (1) A = -B (2) B = C   [#permalink] 24 Dec 2018, 01:30
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