HATE SUMMER WORK! Please help =]?

Question

A bag contains 5 red, 5 white, 5 blue, and 5 green marbles. Two marbles are drawn, but the first marble drawn is not replaced. Find P(red then blue)

Please show work thanks =]

Answer 1

All the marbles when added up is 20.

When you draw the first red marble, the P is 5/20.

The next blue one is 5/19 because the other is not replaced

Answer 2

please show work.... hmm?

i happen to know the answer from doing the work in my head, but i dont think other people should be doing your homework just because you dont know how to do it.

good luck with YOUR work.