This data sufficiency problem consists of a q...

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This data sufficiency problem consists of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements, plus your knowledge of mathematics and everyday facts (such as the number of days in a leap year or the meaning of the word counterclockwise), you must indicate whether -
Q. Is x/y a terminating decimal?
1. x is a multiple of 2
2. y is a multiple of 3
• a)
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.
• b)
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.
• c)
BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
• d)
• e)
Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.

Step 1 of solving this GMAT DS question: Understand the Question Stem
What kind of an answer will the question fetch?
The question is an "Is" question. Answer to an "is" question is either YES or NO.
When is the data sufficient?
The data is sufficient if we are able to get a DEFINITE YES or a DEFINITE NO from the information given in the statements.
If the statements do not have adequate data to provide a CONCLUSIVE answer and we get YES for some instances and NO for others, the given data is NOT sufficient.
What is a terminating decimal?
Numbers that have finite number of digits after the decimal point are called terminating or finite decimals. e.g., 2.5, 0.25, 8.
Note: All integers are terminating decimals.
Numbers that have infinite digits after the decimal point are called non-terminating or infinite decimals
Step 2 of solving this GMAT DS question: Evaluate Statement (1) ALONE
Statement (1) : x is a multiple of 2
No information about y has been provided.
Approach: Let us look for a counter example.
Example: When x = 2 and y = 3, x/y is non-terminating.
The answer to the question is NO.
Counter Example: When x = 2 and y = 4, x/y is terminating.
The answer to the question is YES.
We have found a counter example. Therefore, statement 1 does not provide a DEFINITE answer.
Statement 1 ALONE is NOT sufficient.
Eliminate choices A and D. Choices narrow down to B, C or E.
Step 3 of solving this GMAT DS question: Evaluate Statement (2) ALONE
Statement (2) : y is a multiple of 3
No information about x has been provided.
Approach: Let us look for a counter example.
Example:When x = 3 and y = 3, xyxy is terminating.
The answer to the question is YES.
Counter Example: When x = 2 and y = 3, x/y is non-terminating.
The answer to the question is NO.
We have found a counter example. Therefore, statement 2 does not provide a DEFINITE answer.
Statement 2 ALONE is NOT sufficient.
Eliminate choice B. Choices narrow down to C or E.
Step 4 of solving this GMAT DS question Evaluate Statements (1) & (2) Together
Statements Together : x is a multiple of 2 & y is a multiple of 3
Approach: Let us look for a counter example.
Example:When x = 6 and y = 6, x/y is terminating.
The answer to the question is YES.
Counter Example: When x = 2 and y = 3, x/y is non-terminating.
The answer to the question is NO.
We have found a counter example. Despite combining the information in the statements we are not able to find a DEFINITE answer.
Statements TOGETHER are NOT SUFFICIENT. Choice E is the answer.

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