A shipment of 8 television sets contains 2 black-and-white sets and 6color sets. If 2 television sets are to be chosen at random from this shipment, what is the probability that at least 1 of the 2 sets chosen will be a black-and-white set?
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A\frac{1}{7}
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B\frac{1}{4}
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C\frac{5}{14}
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D\frac{11}{28}
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E\frac{13}{28}
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正确答案: E