Question 616267
It really depends on how many reds and how many blues there are. Say you had 6 reds and 1 blue. Assuming you can't distinguish between two reds or two blues (ie tell them apart), this would mean you would have



R, B, B, B, B, B, B
B, R, B, B, B, B, B
B, B, R, B, B, B, B
B, B, B, R, B, B, B
B, B, B, B, R, B, B
B, B, B, B, B, R, B
B, B, B, B, B, B, R



So you would have 7 ways to order this


But, if you have 5 reds and 2 blues, then there would be a lot more ways to order the marbles.


So we would need to know how many red and blue marbles there are.