SOLUTION: <b> Solve using whatever counting methods are necessary. Please show work.</b> A box contains 5 red marbles and 7 black marbles. You draw 4 marbles randomly from the box. What i

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4 options:
RRRB
RRBR
RBRR
BRRR

Look at RRRB ans assuming there is no replacement of marbles during this process:
First out is red: P = 5/12
second out is red: P = 4/11
third out is red: P = 3/10
fourth out is black: P = 7/9

--> P =

Now look at RRBR:
--> P =
which if you look closely is the same thing as RRRB

So, in total we have 4 versions of the same thing
--> P =
--> P =
--> P =
--> P =
--> P =
--> P =
--> P = 0.141414

jon.