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I was looking back on some old comb/perm problems, and had a question on this old post....
Why would the answer to this question be 3 instead of 4? If it is asking for the "number of ways" doesn't that indicate permutation, in which case order matters? Therefore, wouldn't we want to treat Blue/Red and Red/Blue as two distinct cases?
gotta agree with guy 123 br and rb are the same thing..if the question hada stem askin us to pick the color r or b first or in some order then the answer wud have been different but it dont specify that.