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The Dow Jones Industrial Average (DJIA) consists of 30 stocks that are meant to reflect U.S....

The Dow Jones Industrial Average (DJIA) consists of 30 stocks that are meant to reflect U.S. market performance. An analyst is planning to post the names of these stocks on two web pages, one marked “Buy” and the other marked “Sell”. No stock name may appear on both pages, but every stock name will appear on one or the other. Conceivably, one of the pages may be empty. In how many ways can the analyst post the stock names to the web pages if the order in which the names appear on those pages does not matter?

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Answer #1

since there is two way for each stock to be: either to appear on first or appear on 2nd page

therefore total number of ways for 30 stocks =230 =1073741824

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