Moderator
Joined: 02 Jan 2020
Status:GRE Quant Tutor
Posts: 1111
Given Kudos: 9
Location: India
Concentration: General Management
Schools: XLRI Jamshedpur, India - Class of 2014
GPA: 2.8
WE:Engineering (Computer Software)
Re: If w, x, y, and z are real numbers, each of the following eq
[#permalink]
02 Jan 2020, 09:18
Notice that the Question is EXCEPT question. So, DO NOT answer in a hurry and mark option A!
Easiest way to solve this is to open the brackets in the question stem and also in the option choices
w(x + y + z) = wx + wy + wz
Taking each option now:
(A) \(wx + wy + wz\)
Same as Question
(B) \((x + y + z)w\)
Opening bracket we get wx + wy + wz, Same as Question
(C) \(wx + w(y + z)\)
Opening bracket we get wx + wy + wz, Same as Question
(D) \(3w + x + y + z\)
This is not equal to question
(E) \(w(x + y) + wz\)
Opening bracket we get wx + wy + wz, Same as Question
So, answer is D.
Hope it helps!