How often can you lose 10 times in a row? Or 20 times in a row with odds of let us say 49.5%.
To calculate such things you have to use this formula, lets say 50% to be easier, you take the loosing chance (50%) and divide it by 100 so 50/100 = 0.50 now for lets say 10 in a row you simply do 0.50 ^ 10 which is 0.0009765625 now you multiply that amount x 100 so ~ 0.098% or in other words 1 in 1000 approximately