>>12783448If in roulette you've first got 10 reds, you then are betting on the different kind of 11-in-a-row streaks which have 10 reds inn the beginning:
RRRRRRRRRRR
and
RRRRRRRRRRB
and that's all of them
so you end up with a 50/50 chance.
You could artificially tie the spins fates together by doubling the bet each round but:
1) needs deep pockets
2) gambling sites know this trick so they limit the maximum size of the bet.