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27 February, 16:31

A town has two shopping malls. A survey conducted on the shopping preferences of the town's residents showed that 62% of the residents visit Comet Mall, 73% of the residents visit Star Mall, and 48% of the residents visit both malls.

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  1. 27 February, 20:24
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    Since 48% shop at both, 14% shop at Willow Creek only,

    and 25% shop at 2 Harbors only.

    So the probability of shopping at at least one is

    48% + 14% + 25% = 87%, or 0.87 (A)
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