roulette - is this normal?

[Neverwin84552]

playing roulette today on an accredited site, and i had 17 numbers covered at various stakes. i went on a run of hitting 1 number in 20 spins, my balance went from 1800 to 850 during tjis run.is this normal, and what are the odds of it happening?

 

[snoopyDog]

If theres 1-36 numbers and one zero, then the chance of you not hitting would be (20/37). The odds of you not hitting 20 times in a row would be (20/37)^20=0.0004%, if my calculations are correct. So not a very big chance, but it will happends once in a while.