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There are 5 red and 3 green pens in a b...

There are 5 red and 3 green pens in a bag.There are 2 red and 6 green pens in another bag. A pen is picked up at random from one bag. Using the following instructions, find the probability that the pen piced up:
from one bag is red.
from another bag is red.
from either of the bags is red.

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