Hello.
I ordered the following 3 Manhattan GMAT guides (edition) :
1. Number Properties (Paperback - Nov 2005)
2. Equations, Inequalities(Paperback - Nov 2005)
3. Sentence Correction(Paperback - Nov 2005)
As you can see, they are not the 2007 edition. Are there substantial differences between these two editions in terms of their contents?
I am not sure whether to keep them or return them for the 2007 editions.
Thank you very much in advance.
Steven