Roulette probabilities "equality"

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If a roulette has equal number of two differently coloured "boxes" arranged alternatingly, the probability of a ball landing on either of the colours should be 1/2. If the like coloured "boxes" were instead arranged all next to each other dividing the roulette into two differently coloured "semicircles" would the probabilty of a ball landing on one of the colours still be 50% or not ? Why?