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The operation* represents either addition, subtraction, or

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The operation* represents either addition, subtraction, or [#permalink]  22 Jan 2010, 23:25
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Question Stats:

51% (01:36) correct 49% (00:30) wrong based on 339 sessions
The operation* represents either addition, subtraction, or multiplication of integers, what is the value of 1*0?

(1) 0*2=2
(2) 2*0=2
[Reveal] Spoiler: OA

Last edited by Bunuel on 03 Jul 2013, 07:49, edited 1 time in total.
Edited the question and the OA.
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Re: Symbols [#permalink]  23 Jan 2010, 00:35
Expert's post
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vaivish1723 wrote:
9
The operation* represents either addition, subtraction, or multiplication of integers,
what is the value of 1*0?
(1) 0*2=2
(2) 2*0=2

OA is
[Reveal] Spoiler:
a

Why cant the OA is D because using statement II we get the same answer and we can use that to solve 1*0.

(1) 0*2=2 --> operation * represents addition --> 1*0=1+0=1. Sufficient.

(2) 2*0=2 --> operation * represents either addition or subtraction --> 1*0=1+0=1 and 1*0=1-0=1, the same answer. Sufficient.

OA must be wrong.
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Re: Symbols [#permalink]  23 Jan 2010, 09:37
I also chose the ans as D
what is the source
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Re: Symbols [#permalink]  26 Jan 2010, 09:01
1
KUDOS
OA is wrong..should be D only.

Lots of OA wrong these days.
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Re: Symbols [#permalink]  05 Jan 2011, 14:31
It is a tricky question. In B. + or - is does not change the answer of the question

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Re: Symbols [#permalink]  03 Jul 2013, 07:47
Bunuel wrote:
vaivish1723 wrote:
9
The operation* represents either addition, subtraction, or multiplication of integers,
what is the value of 1*0?
(1) 0*2=2
(2) 2*0=2

OA is
[Reveal] Spoiler:
a

Why cant the OA is D because using statement II we get the same answer and we can use that to solve 1*0.

(1) 0*2=2 --> operation * represents addition --> 1*0=1+0=1. Sufficient.

(2) 2*0=2 --> operation * represents either addition or subtraction --> 1*0=1+0=1 and 1*0=1-0=1, the same answer. Sufficient.

OA must be wrong.

Hi Bunuel,

Operation from statement 1: You assumed 0*2 is an "addition" operation i.e. a*b = a +b. But couldn't it be assumed that a*b could also be = b-a (subtraction) ?. And hence 0*2 = 2-0 = 2. Isn't this statement insufficient because of 2 scenarios?

Where as in statement 2: 2*0 could be 2-0 = 2 or 2+0= 2. In either case, this statement alone is sufficient. Hence answer is B.

Am I missing something ?

Best
Rohan
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Re: Symbols [#permalink]  03 Jul 2013, 08:06
Expert's post
RohanKhera wrote:
Bunuel wrote:
vaivish1723 wrote:
9
The operation* represents either addition, subtraction, or multiplication of integers,
what is the value of 1*0?
(1) 0*2=2
(2) 2*0=2

OA is
[Reveal] Spoiler:
a

Why cant the OA is D because using statement II we get the same answer and we can use that to solve 1*0.

(1) 0*2=2 --> operation * represents addition --> 1*0=1+0=1. Sufficient.

(2) 2*0=2 --> operation * represents either addition or subtraction --> 1*0=1+0=1 and 1*0=1-0=1, the same answer. Sufficient.

OA must be wrong.

Hi Bunuel,

Operation from statement 1: You assumed 0*2 is an "addition" operation i.e. a*b = a +b. But couldn't it be assumed that a*b could also be = b-a (subtraction) ?. And hence 0*2 = 2-0 = 2. Isn't this statement insufficient because of 2 scenarios?

Where as in statement 2: 2*0 could be 2-0 = 2 or 2+0= 2. In either case, this statement alone is sufficient. Hence answer is B.

Am I missing something ?

Best
Rohan

In (1) the operation cannot be subtraction, since $$0-2=-2$$ and not 2, as stated. But even if you were right, so suppose the operation can be addition or subtraction (as in the second statement), still (1) would be sufficient because we need to find the value of 1*0 which is the same for either of these two operations (+ or -).

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Hope it helps.
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Re: Symbols [#permalink]  03 Jul 2013, 08:39
Bunuel, Thanks for you reply. However by subtraction, I meant 2-0=2 not 0-2=-2. i.e. the operation 0*2 can be construed as addition (like you said) i.e. 2+0=2 or subtraction i.e 2-0=0. Please note that for subtraction, I am considering the case: a*b=b-a (which is 2-0 = 2) and not a-b (which is 0-2=-2) . hope my query is clear to you ?
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Re: The operation* represents either addition, subtraction, or [#permalink]  03 Jul 2013, 09:13
Expert's post
RohanKhera wrote:
Bunuel, Thanks for you reply. However by subtraction, I meant 2-0=2 not 0-2=-2. i.e. the operation 0*2 can be construed as addition (like you said) i.e. 2+0=2 or subtraction i.e 2-0=0. Please note that for subtraction, I am considering the case: a*b=b-a (which is 2-0 = 2) and not a-b (which is 0-2=-2) . hope my query is clear to you ?

Notice that the first statement is 0*2 not 2*0.
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Re: The operation* represents either addition, subtraction, or [#permalink]  03 Jul 2014, 23:57
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Re: The operation* represents either addition, subtraction, or [#permalink]  18 Oct 2014, 11:40
D.

From 1, * cannot be multiplication and subtraction. so 1+0 = 1
From 2, * can be addition or subtraction, but 1-0 = 1 or 1+0 = 1

Thus both statement sufficient. Please check what question is asking this is good trap that test makers exploit.

vaivish1723 wrote:
The operation* represents either addition, subtraction, or multiplication of integers, what is the value of 1*0?

(1) 0*2=2
(2) 2*0=2

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[Reveal] Spoiler:

Re: The operation* represents either addition, subtraction, or   [#permalink] 18 Oct 2014, 11:40
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