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Bunuel
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Is A + B + C = 0? (1) A = -B (2) B = C 04 Dec 2018, 03:07
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E
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25% (medium)

Question Stats:

72% (00:59) correct 28% (00:50) wrong based on 250 sessions

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Is A + B + C = 0?

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


M36-27

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E
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Bunuel
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Is A + B + C = 0? (1) A = -B (2) B = C 11 Oct 2021, 08:23
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Bunuel
Is A + B + C = 0?

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


M36-27
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Official Solution:


Is \(A + B + C = 0\)?

(1) \(A = -B\)

The question becomes: is \((-B) + B + C = 0\)?, and then is \(C = 0\)? We don't know the answer to this question. Not sufficient.

(2) \(B = C\)

The question becomes: is \(A + C + C = 0\)?, and then is \(A + 2C = 0\)? We don't know the answer to this question. Not sufficient.

(1)+(2) We know that \(B = -A = C\), so the question becomes: is \((-B) + B + B = 0\)? and then is \(B = 0\)? We don't know the answer to this question. For example, if \(B = -A = C=0\), then \(A + B + C = 0\) but if \(B = -A = C=1\), then \(A + B + C = 1\). Not sufficient.


Answer: E
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Is A + B + C = 0? (1) A = -B (2) B = C Updated on: 04 Dec 2018, 03:40
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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Bunuel
Is A + B + C = 0?

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


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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Is A + B + C = 0? (1) A = -B (2) B = C 04 Dec 2018, 03:35
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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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Is A + B + C = 0? (1) A = -B (2) B = C 04 Dec 2018, 03:37
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Archit3110
Bunuel
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
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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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Is A + B + C = 0? (1) A = -B (2) B = C 04 Dec 2018, 03:39
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DavidTutorexamPAL
Archit3110
Bunuel
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.
Show more

DavidTutorexamPAL :
yeah understood , where i went wrong.. E would be correct in that case ..
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Is A + B + C = 0? (1) A = -B (2) B = C 04 Dec 2018, 04:03
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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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Is A + B + C = 0? (1) A = -B (2) B = C 04 Dec 2018, 04:31
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Bunuel
Is A + B + C = 0?

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

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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Is A + B + C = 0? (1) A = -B (2) B = C 04 Dec 2018, 11:49
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Archit3110
Bunuel
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
Show more

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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Bunuel
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Is A + B + C = 0? (1) A = -B (2) B = C 24 Dec 2018, 01:30
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Bunuel
Is A + B + C = 0?

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