A bag contains blue, green and red pens of the same type in the ratio 8:2:5 respectively. A pen is picked at random without...

A bag contains blue, green and red pens of the same type in the ratio 8:2:5 respectively. A pen is picked at random without replacement and its colour noted.
a)Determine the probability that the first pen picked is
i)Blue
ii)Either green or red.
b)Using a tree diagram, determine the probability that
i)The first two pens picked are both green
ii)Only one of the first pens picked is red.

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Kavungya answered the question on September 17, 2019 at 09:08

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