Probability increments

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Say you have three boxes and one of them has a ball in it. Box A has 50% probability to have the ball in it while the other two (Box B and Box C) have 25% probability each. If you open Box C and find that it doesn't have the ball in it, how does this increase the probability for the remaining two boxes? I presume Box A now has a probability of 66.7% while Box B has 33.3% probability. Is this correct?