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There are 10 equally-weighted balls in a non-transparent bag, we know in advance that 4 of...

  1. There are 10 equally-weighted balls in a non-transparent bag, we know in advance that 4 of them are yellow balls and 6 of them are white balls, now we randomly pick 2 balls out of the bag. (10 pt)
    1. Use the combination equation to compute the probability of obtaining 2 yellow balls.
    2. Use the combination equation to compute the probability of obtaining 1 yellow ball and 1 white ball.

  1. Let us randomly select 3 different numbers from 0 to 9, use the combination equation to compute the probability that the maximum of these 3 numbers selected is 5. (10 pt)
Math   Statistics-And-Probability   
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Answer #1

Here we use the concept of combinations to solve this problem

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