What is the median of set s = (a-b,b-a,a+b) ?
1:The mean of set S is equal to a+b
2:The range of set S is equal to 2b
A
please answer my query as well.
stat 1 is pretty straight:
stat-2.
Since I was able to determine that statement 2 says that the median is b-a, I considered it sufficient.
Official answer says since we cannot determine the value hence 2 is insuff.
Where has it been worded we need to find a value of the median ?
This is similar to saying- Which of the two numbers is greater a or b ?
statement 1. b = a.
Is'nt the above statement sufficient ???
On similar lines should statement 2 not be sufficient since we have a definite algebraic value
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- bblast
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a a+b/3 = a+b where a=-b
hence -2b,0,2b will always give 0 as the median. sufficient.
b means b-a and a+b can either be min or max values.
thus a-b is the median.since we don't know a-b = some value.Not sufficient.
A it is.
hence -2b,0,2b will always give 0 as the median. sufficient.
b means b-a and a+b can either be min or max values.
thus a-b is the median.since we don't know a-b = some value.Not sufficient.
A it is.
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If you read the instructions given for DS on the GMAT, you'll see:bblast wrote:
Where has it been worded we need to find a value of the median ?
NOTE: In data sufficiency problems that ask for the value of a quantity, the data given in the statements are sufficient only when it is possible to determine exactly one numerical value for the quantity.
So if a DS question asks for the median of a set, you only have sufficient information if you can get a single numerical value for the median.
No, it is not the same type of question. The question you are asking does not ask for a value; it only asks whether a > b is true. You can answer that question without knowing the values of a or b.bblast wrote:
This is similar to saying- Which of the two numbers is greater a or b ?
statement 1. b = a.
Is'nt the above statement sufficient ???
On similar lines should statement 2 not be sufficient since we have a definite algebraic value
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- bblast
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Thanks Ian, I read the other discussion on this question between Bunuel and yourself, was very helpful.
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Quant 47-Striving for 50
Verbal 34-Striving for 40
My gmat journey :
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My take on the GMAT RC :
https://www.beatthegmat.com/ways-to-bbla ... 90808.html
How to prepare before your MBA:
https://www.youtube.com/watch?v=upz46D7 ... TWBZF14TKW_