In a drawer there are 30 ribbons...

Malual90

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Dec 30, 2013
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In a drawer there are 30 ribbons, 16 are blue and the rest are red. Two ribbons are selected at random from the drawer, without replacement.
Draw a probability tree diagram to represent this problem. Label the end of each branch with the simple events and include the probabilities along each branch of the tree.

If two ribbons are drawn at random what is the probability of selecting a pair of matching ribbons (two ribbons the same colour)?



so far I have figured out the probability of red is 0.47 and probability of blue is 0.53. that the first branch stuck on the second one...
 
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