Suppose that we have a white urn containing four white balls and one red ball and have a red urn containing one white ball and four red balls. An experiment consists of selecting at random a ball from the white urn and then (without replacing the first ball) Selecting at random a ball from the urn having the colour of the first ball. Find the probability that the second ball is red.
The probability that the second ball is red is ______.

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so the sum of (4/20)+(4/25)
So in this case the answer would be 0.36 correct?

Correct, or alternatively 9/25.

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