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19 March, 19:26

Ling is taking a quiz that consists of 3 multiple-choice questions, each having 3 answers. If she guesses on each question, what's the probability that Ling will get 100% on the quiz?

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  1. 19 March, 21:29
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    There are 3 ways in which you can answer each of the question in a 3 multiple-choice question. All in all, there are 27 ways in which Ling can answer the questions. Of these combinations, only one of which will give her a 100%. Thus,

    probability = (1/27) x 100%

    = 3.70%

    Therefore, the probability that Ling will get 100% on the quiz is very lean with a value of only 3.70%.
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