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A survey determines that there is a three in twelve chance that a randomly selected student drives a Toyota, a two in twelve chance that

A survey determines that there is a three in twelve chance that a randomly selected student drives a Toyota, a two in twelve chance that a randomly selected student drives a grey car, and a one in twelve chance that a randomly selected student drives a grey Toyota. What is the probability that a randomly selected student either drives a grey car or a Toyota?

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