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ashikaverma13
GMAT 1: 640 Q47 V31
Posts: 123
Updated on: 08 Dec 2016, 00:51
Originally posted by ashikaverma13 on 07 Dec 2016, 23:17.
Last edited by Bunuel on 08 Dec 2016, 00:51, edited 1 time in total.
Last edited by Bunuel on 08 Dec 2016, 00:51, edited 1 time in total.
Renamed the topic and edited the question.
Kudos
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
44% (01:12) correct
56%
(01:02)
wrong
based on 1045
sessions
History
Date
Time
Result
Not Attempted Yet
Is z an odd number?
(1) 3z is an odd number.
(2) z/3 is an odd number.
(1) 3z is an odd number.
(2) z/3 is an odd number.
08 Dec 2016, 00:48
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Hi Ashikaverma13,
The best way to approach inequality questions of this type is to plug in values. There are two things you need to keep in mind while plugging in values on a Yes/No DS question
1. Plug in values to satisfy the statement first and then answer a Yes or No to the main question.
2. Plug in values to disprove the statement i.e. if you plug in a value which gives you a YES, try to plug in a value to get a NO instead of trying to get a definite YES or No and prove it sufficient
Also in questions where you are not given any constraint, you need to be doubly careful. Here we have not been given any information about the type of number z is. So z can be any real number. The trap here would be to assume that z has to be a positive integer.
Is z an odd number?
Keep in mind that only positive and negative numbers can be odd or even. We cannot have fractions or irrational numbers to be odd or even.
Statement 1 : 3z is an odd number
Plug in z = 1. This gives us a YES.
Plug in z =1/3. This gives us a NO. Insufficient.
Statement 2 : z/3 is an odd number
z/3 = odd -----> z = odd * 3 -----> z = odd. Sufficient.
OA : B
CrackVerbal Academics Team
The best way to approach inequality questions of this type is to plug in values. There are two things you need to keep in mind while plugging in values on a Yes/No DS question
1. Plug in values to satisfy the statement first and then answer a Yes or No to the main question.
2. Plug in values to disprove the statement i.e. if you plug in a value which gives you a YES, try to plug in a value to get a NO instead of trying to get a definite YES or No and prove it sufficient
Also in questions where you are not given any constraint, you need to be doubly careful. Here we have not been given any information about the type of number z is. So z can be any real number. The trap here would be to assume that z has to be a positive integer.
Is z an odd number?
Keep in mind that only positive and negative numbers can be odd or even. We cannot have fractions or irrational numbers to be odd or even.
Statement 1 : 3z is an odd number
Plug in z = 1. This gives us a YES.
Plug in z =1/3. This gives us a NO. Insufficient.
Statement 2 : z/3 is an odd number
z/3 = odd -----> z = odd * 3 -----> z = odd. Sufficient.
OA : B
CrackVerbal Academics Team
General Discussion
08 Dec 2016, 01:08
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IMO: B
Explanation:
Statement 1 : 3z is an odd number
for z = 1. YES.
for z = 7/3. NO.
Insufficient.
Statement 2 : z/3 is an odd number
z/3 = odd
odd * 3 = odd
Therefore, z = odd.
Sufficient.
Thus, answer is B
Explanation:
Statement 1 : 3z is an odd number
for z = 1. YES.
for z = 7/3. NO.
Insufficient.
Statement 2 : z/3 is an odd number
z/3 = odd
odd * 3 = odd
Therefore, z = odd.
Sufficient.
Thus, answer is B
