On Page. 53 (Combinatorics) (5th ed. - Num Properties) Chapter 3 Problem 4:
A pod of dolphins always swim in single file, with 3 females at the front and 3 females in the rear. In how many different arrangements can the dolphins swim?
I understand the multiple groups piece and how we multiple female arrangements * male arrangements, but am struggling conceptually with why we are not taking into consideration order? I don't understand why there are only 3! ways in which the females can swim? There are 3 ways in which females can be first in the line but then, the 2nd and 3rd dolphin can switch spots. Let's say there are dolphins S, A, and M.
S M A
A S M
M A S
but they could also be
S M A
M A S
A S M
What am I missing here?