Example 10: Drawing marbles How many ways can you order 3 blue marbles, 4 red marbles, and 5 green marbles? Marbles of the same color look identical. Definition: Combination A combination is an arranging of distinct objects where order does not matter and repetition is not allowed. Write down the formula from the video in the space below. Example 11: Manufacturing You manufacture calculators. Suppose that due to a manufacturing error, a box of ten calculators contains three defective calculators. To test your quality control department, you have a worker choose 2 calculators from the box. What is the probability that your quality control department chooses no defective calculators?

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