T-test question

Our assignment had us look at several variables for 3 different groups: g1, g2, g3

the first part of the question just asks me to use a statistical package to examine the differences between g1 and g2 on three variables.

I got that.

The second part of the question asks " Are these t-tests independent of one another?" -- it also hints that you must delete all the data from g3 (which we never used anyway) to solve the problem.

Any ideas on how to answer this o_O?