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Probability: Randomly Selecting Marbles

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Question: A bag contains 40 blue marbles, 40 red marbles, and 20 green marbles. 60 of the marbles are big. These marbles are selected at random without replacement.

What is the probability of randomly selecting three big blue marbles?

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The definition of probability is P = Number of big blue marbles/Total possible outcomes

First, we find that among the total 100 marbles (=40+40+20), 40 marbles are ...

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