Question

There is a bag filled with 5 blue and 4 red marbles.
A marble is taken at random from the bag, the colour is noted and then it is replaced.
Another marble is taken at random.
What is the probability of getting 2 that are different in colour?

Answer 1

Answer: 1 out of 2

Step-by-step explanation:

1 out of 2 as there are only two colours

Option 1: 2 the same colour

Option 2: 1 of each colour

Answer 2

Using the concept of probability, the probability of choosing marble of different color is 0.494

• Total number of marbles = (5 + 4) = 20
• Blue marbles = 5
• Red marbles = 4

• Probability = required outcome //total possible outcomes

Probability of getting marbles of different color :

P(Red, Blue) or P(blue, Red)

(4/9 × 5/9) + (5/9 × 4/9)

0.2469135 + 0.2469135

= 0.494

Hence, probability of picking marbles of different color is 0.494

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