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A survey of 28 teens in a community theater group found that 12 teenagers had a sister, 7 teenagers had a brother, and 3 teenagers

A survey of 28 teens in a community theater group found that 12 teenagers had a sister, 7 teenagers had a brother, and 3 teenagers had both a sister and a brother. What is the probability that a randomly selected teenager who has a sister also has a brother

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