1) Below you can see one state when series alternating, they chop with an continues flow.
RRRBBBBRRBBBBBBBRRRRRBBBRRRRRR
2) Below you can see one state when singles alternating, they chop with an continues flow.
RBRBRBRBRBRB
3) Below you can see one state when series and singles as isolated events are alternating, chop with an continues flow.
RRRRRRRBRRRRBRRRRRBRRRRRRBRRR
There is the same amount of singles as there is series in an perfect world and have the same probability as R and B 50/50 situation.