Pregunta
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A
Find each probability if you pick a marble, do not replace it, then pick a second marble ( red; blue; green)
(blue, then green)
(15) green, then red)
(green, then green)
(17) (green, then not green)
red, then blue)
(19) (red, then not blue)
(blue, then blue)
(21) (not blue, then not blue)

Ask by Clarke Chan. in the United States
Mar 24,2025

Solución de inteligencia artificial de Upstudy

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To find the probabilities of drawing marbles of different colors without replacement, you need to know the total number of marbles of each color. Use the formulas provided to calculate each probability by substituting the actual counts of red ( ), blue ( ), and green ( ) marbles.

Solución

To find the probabilities of drawing marbles of different colors without replacement, we need to know the total number of marbles of each color. Let’s assume the following counts for the marbles:
  • : Number of red marbles
  • : Number of blue marbles
  • : Number of green marbles
Let’s denote:
  • Total marbles =
Now, we can calculate the probabilities for each scenario step by step.
  1. Probability of picking a blue marble, then a green marble:
    Therefore,
  2. Probability of picking a green marble, then a red marble:
    Therefore,
  3. Probability of picking a green marble, then another green marble:
    Therefore,
  4. Probability of picking a green marble, then not green:
    Therefore,
  5. Probability of picking a red marble, then a blue marble:
    Therefore,
  6. Probability of picking a red marble, then not blue:
    Therefore,
  7. Probability of picking a blue marble, then another blue marble:
    Therefore,
  8. Probability of picking not blue, then not blue:
    Therefore,
Now, you can substitute the values of , , and into these formulas to find the specific probabilities. If you provide the counts of each color, I can calculate the exact probabilities for you.

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The Deep Dive

Let’s make marble probability calculations a bit more colorful! When picking two marbles without replacement, the probabilities can be deliciously dynamic. Imagine you have a jar filled with red, blue, and green marbles. If you start with eight marbles total: 3 red, 3 blue, and 2 green, the calculations change based on what you grab first!
For example, if you pick a blue marble first and then a green marble, the probability is calculated as the chance of picking blue first (3/8) multiplied by the chance of picking green after that (2/7), leading to or simplified to . Variations abound depending on your combinations of color choices!
Now, a common pitfall in these marble problems is forgetting to adjust the total count as you draw marbles from your selection. Always remember that the total decreases with each pick! If you mistakenly keep the total the same after one marble is drawn, your probabilities will be off. Keep that in mind for those tricky blue-then-red or green-then-not-green scenarios!

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