Two thousand randomly selected adults were asked whether or not they have ever shopped on the Internet. The following table gives a two-way classification of the responses.

Suppose one adult is selected at random from these 2000 adults. Find the following probabilities.
a. P(has never shopped on the Internet or is a female)
b. P(is a male or has shopped on the Internet)
c. P(has shopped on the Internet or has never shopped on the Internet)

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Have Shopped 500 300 Have Never Shopped 700 500 Male Female