Marbles question probability

 

“Suppose you have a bag containing 5 red marbles, 3 blue marbles, and 2 green marbles. You randomly select two marbles from the bag without replacement. What is the probability that the first marble drawn is red and the second marble drawn is blue?”

Sample Solution

Absolutely! Let’s analyze the scenario to find the probability of drawing a red marble followed by a blue marble without replacing them.

We can approach this problem by considering the probability of each event happening sequentially.

  1. Probability of drawing a red marble first:

    • There are 5 red marbles out of a total of (5 + 3 + 2) = 10 marbles.
    • So, the probability of picking a red marble first is 5/10.
  2. Probability of drawing a blue marble second (after taking out a red marble):

    • Since we’re not replacing the marbles, there are only 9 marbles left after taking out the red one.
    • Out of the remaining 9 marbles, there are still 3 blue marbles.
    • Therefore, the probability of picking a blue marble after taking out a red marble is 3/9.

Now, to get the overall probability of both events happening (red first, then blue), we multiply these two probabilities:

(Probability of red) * (Probability of blue after red) = (5/10) * (3/9)

This simplifies to 1/6.

Therefore, the probability of drawing a red marble followed by a blue marble without replacement is 1/6.

 

 

 

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