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Read the following response to your first post.
http://www.jiskha.com/display.cgi?id=1496868084
You roll a red number cube and a blue number cube. Let A be the event "at least one number cube shows a 6"
a) Find P(A) by finding the sum of P(6 on red cube, no 6 on blue cube), P(no 6 on red cube, 6 on blue cube), and P(6 on both cubes)
b) Describe the event "not A" then find P(not A) and use it to find P(A)
c) Compare the methods in part a and b.
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