[ QUOTE ]
You sit at a roulette table for 100 spins (just watching) and every one is black. Do I have a better chance of winning if I now put my money on red?

[/ QUOTE ]
No...there is a "50%" chance of it hitting red or black on any given spin. (Of course, it's actually slightly less than 50% due to 0 and 00.)

If you were to instead ask "what are the odds of it hitting black then red?", the answer would be ~25%.