You can put this solution on YOUR website! Since AB > AC, this means that C > B (a drawing will show that C is opposite to AB and B is opposite to AC)
Now plug in B = 60 (given) to go from
C > B
to
C > 60
which means that C is some angle that is larger than 60 degrees. Keep in mind that C must also be less than 180 - 60 = 120 degrees in order for all three angles to add to 180 degrees.
So we know that C > 60 and C < 120. Put this together to get this restriction on angle C
60 < C < 120
Which effectively says "C is some angle between 60 degrees and 120 degrees (excluding both endpoints)"