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Probability: Randomly Selecting Marbles

I need you to explain to me step by step how to solve this problem. I am having trouble understanding this question.
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?

Solution Preview

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 ...

Solution Summary

This solution is comprised of a detailed, step by step explanation of how to solve this probability problem. This solution should be useful in assisting a student to answer other questions of a similar nature.

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