How many distinguishable ways can you arrange the following marbles?
2 red, 1 green, 4 yellow
a. 48
b. 105
c. 630

I would say A. 48 But thats just how many I got i suggest you have a vote because someone else might count more than myself. Thats up to you though i hope this helps.
 

The method to find the female dormitory is 2-d=800