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Of the last three chapter tests given in an astronomy class, 2 students passed all three tests, 6 students passedtwo tests, and 9 students passed

Of the last three chapter tests given in an astronomy class, 2 students passed all three tests, 6 students passedtwo tests, and 9 students passed one test. If a single student is picked at random, what is the probability that the student passed two tests or passed one test?

  • Provide the final answer as a fraction.

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