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# M21-05

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Math Expert
Joined: 02 Sep 2009
Posts: 94354
Own Kudos [?]: 641093 [3]
Given Kudos: 85011
Math Expert
Joined: 02 Sep 2009
Posts: 94354
Own Kudos [?]: 641093 [0]
Given Kudos: 85011
Intern
Joined: 03 Mar 2017
Posts: 2
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Math Expert
Joined: 02 Sep 2009
Posts: 94354
Own Kudos [?]: 641093 [0]
Given Kudos: 85011
pedrocaa wrote:
I really can't understand why the answer isn't D.
If the range(Highest - Lowest) is 2B, this means that the highest term of the set is a+b and the lowest is a-b.

If i know the highest and the lowest term of a 3 part set, i can know which one is the middle term, therefore, i know which term is the median, B-A. Even considering B=3 or B=0 this answer will work.

Can someone explain this to me?

This is a value DS question. When a DS question asks about the value of some variable, then the statement(s) is sufficient ONLY if you can get the single numerical value of this variable.

In a Yes/No Data Sufficiency questions, statement(s) is sufficient if the answer is “always yes” or “always no” while a statement(s) is insufficient if the answer is "sometimes yes" and "sometimes no".
Senior Manager
Joined: 08 Jun 2015
Posts: 258
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Location: India
GMAT 1: 640 Q48 V29
GMAT 2: 700 Q48 V38
GPA: 3.33
+1 for A.
Math Expert
Joined: 02 Sep 2009
Posts: 94354
Own Kudos [?]: 641093 [0]
Given Kudos: 85011