Box contains 5 blue balls and 5 red balls. Randomly pick 3 balls with replacement and record the color (Pick one first and put it back, then pick the second one, put it back and the third one). Find the probability that we get 2 red balls and 1 blue ball.

1/8

Step-by-step explanation:

Total number of balls is 5 red balls + 5 blue balls = 10 balls

Now probability of picking a blue ball is equal to the probability of picking a red ball. This is because we have equal number of blue balls as red balls.

P(B) = 5/10 = 1/2 = P(R)

Now probability of picking 2 red balls and 1 blue ball with replacement will be :

1/2 * 1/2 * 1/2 = 1/8

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step-by-step explanation: