Easy Ratio Vector Question, but not sure if answer is wrong

[geoff18]

Homework Statement

Let A, B be points in R3 with position vectors

a:(7,-2,3)
b:(1,-5,0)

Let Q be the point on AB such that AQ= 2/3 AB
Find q, the position vector of Q

Homework Equations

The back of the book says the answer is: (2,-3,-1)

The Attempt at a Solution

First, I found the vector of AB: (-6,-3,-3)
So Q should be: a+(2/3)(AB)
ie: (7,-2,3)+(-4,-2,-2)
=(3,-4,1)
Which is different to the answer given by the book.
Did i do anything wrong?
Thanks

 

[vikas92]

What you have done is right