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If [] represents +,x,-, or / (one of these), then which does

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If [] represents +,x,-, or / (one of these), then which does [#permalink] New post 13 Sep 2010, 14:53
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B
C
D
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I had this question on a test. If [] represents +,x,-, or / (one of these), then which does [] refer to?
1. 2 [] 2 = 4
2. 0 [] 1 = 0

I marked C since I saw that x satisfies both. However the answer is given to be B - their reasoning is that / and x satisfies (2). But should I not be finding a operation. How is the answer C?
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Re: DS question [#permalink] New post 13 Sep 2010, 15:38
Expert's post
mainhoon wrote:
I had this question on a test. If [] represents +,x,-, or / (one of these), then which does [] refer to?
1. 2 [] 2 = 4
2. 0 [] 1 = 0

I marked C since I saw that x satisfies both. However the answer is given to be B - their reasoning is that / and x satisfies (2). But should I not be finding a operation. How is the answer C?


Are you sure it's GMAT Prep question? I've never seen DS question asking to identify some symbol. GMAT DS questions are either YES/NO type or asking to find numerical value of some quantity. Please check the question and/or the source.

For example below are similar questions to the one you've posted:

1. The operation * represents either addition, subtraction, or multiplication of integers, what is the value of 1*0? (This question asks for the numerical value of some expression)
(1) 0*2=2
(2) 2*0=2

(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.

Answer: D.

2. If the operation # is one of the four arithmetic operations- addition, subtraction, multiplication and division. Is (6#2)#3 = 6#(2#3) (This is YES/NO DS question)
(1) 3#2 > 3
(2) 3#1 = 3,

(1) 3#2 > 3, # can be either multiplication or addition in BOTH cases (6#2)#3 = 6#(2#3) is true: (6*2)*3=6*(2*3)=36 and (6+2)+3=6+(2+3)=11. Sufficient.

(2) 3#1 = 3, # can be either multiplication or division. If it's division the the answer to the question is No and if it's multiplication answer to the question is YES. Two different answers. Not sufficient.

Answer: A.
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Re: DS question [#permalink] New post 13 Sep 2010, 16:01
Bunuel
Good point you make. I saw this question on the Veritas test, perhaps you are right that it was asking what is 1[]1? I probably went with just trying to identify the []? But if the question asked what was [], what would the answer be?
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Re: DS question [#permalink] New post 13 Sep 2010, 16:07
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mainhoon wrote:
Bunuel
Good point you make. I saw this question on the Veritas test, perhaps you are right that it was asking what is 1[]1? I probably went with just trying to identify the []? But if the question asked what was [], what would the answer be?


OK.

If [] represents +,x,-, or / (one of these), then which does [] refer to?
(1) 2 [] 2 = 4 --> operation represents addition or multiplication. Two answers, not sufficient.

(2) 0 [] 1 = 0 --> operation represents either division or multiplication. Two answers, not sufficient.

(1)+(2) Symbol must be multiplication to satisfy both statements. Sufficient.

Answer: C.
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Re: DS question [#permalink] New post 13 Sep 2010, 19:10
So answer in original post is not correct. I also feel its C, but mainhoon seem to suggest answer was B
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Re: DS question [#permalink] New post 13 Sep 2010, 19:17
No I am not suggesting answet is B or C. It depends on the phrasing of the question. If looking to determine [], then it is C if it is what is that value of 1[]1 then it is B...
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Re: DS question [#permalink] New post 13 Sep 2010, 19:17
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saxenashobhit wrote:
So answer in original post is not correct. I also feel its C, but mainhoon seem to suggest answer was B


I think original question itself is not correct. As mainhoon noted it's possible that question asked for the value of 1[]1.

If the question were "what is the value of 1[]1" then the answer indeed would be B: as for (2) no matter whether operation represents division or multiplication 1[]1 will equal to 1 only, so statement would be sufficient.
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COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: DS question   [#permalink] 13 Sep 2010, 19:17
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