Probability question. Roulette dozens bet occurring consecutively.

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Hello Mathematics Guru's,

Can I first caveat this question by saying, I'm wholly aware the house always has a mathematical edge if you play long enough in Roulette, but i am interested to know the following all the same.

I would like to know the percentage chance of the following occurring playing Roulette.

I like to bet on 2 of the dozen bets, which pays 2:1. Specifically the middle column (13-24) and high column (25-36) at the time covering approximately 64.8% of the board.

So my question is, what is the percentage chance of the low column numbers (1-12) and the zero occurring, ie the numbers i'm not betting on hitting consecutively? Specifically, 6, 7 and 8 times in a row.

Many thanks

Keir