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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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.
_________________

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory

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. NEW!!!

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. NEW!!!


What are GMAT Club Tests?
25 extra-hard Quant Tests

Find out what's new at GMAT Club - latest features and updates

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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