Welcome to our forum
I see you have already contributed a lot of good quality answers.
Knowing how soccer is played I am sure your answer, in the real world, wold be correct.
I have interpreted it differently.
I don't think you should assume that everyone answering this question knows the rules of soccer.
The info that you need should be in the question.
So i have assumed that the goalie can be any of the 16 players.
Choose the 11 playrers and then chose the goalie from them
16C11 *10 = 4368 * 11 = 48048
Chose the goalie and then choose the 10 players.
16*15C10 = 16 * 3003 = 48048