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Probability of movie sales

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The probability that person going to a movie will buy a soft drink is 0.20; the probability that the person will buy popcorn is 0.40; and the probability that the person will buy both a soft drink and popcorn is 0.10. If one movie-going person is selected at random, what is the probability that:

A) He/she will buy popcorn or a soft drink?
B) He/she will buy a soft drink, given that he/she has bought popcorn?
C) He/she will buy neither a soft drink nor popcorn?

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This job figures the probability of movie sales.

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The probability that person going to a movie will buy a soft drink is 0.20; the probability that the person will buy popcorn is 0.40; and the probability that the person will buy both a soft drink and popcorn is 0.10. If one movie-going person is selected at random, what is the probability that:

A) He/she will buy popcorn or a soft drink?

The probability that a person will buy popcorn or a soft drink ...

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