Question

Suppose you choose marble from a bag containing 2 red marbles, 5 white marbles, and 3 blue marbles. You return the first marble to the bag and choose again. How do you find P(red then blue)?

Answer 1

`1/10`

Explanation:

There are 10 marbles. The probability of drawing a red is `2/10=1/5`, white is `5/10=1/2` and blue is `3/10`.

I can then say the probability of drawing a red, replacing it, and then a blue is:

`P("drawing red then blue, with replacement")=1/5xx1/2=1/10`