Terri has 7 pens in a box.
2 of the pens are blue.
4 of the pens are red.
Terri...
Mathematics, 05.05.2020 09:03 bbb4951
Terri has 7 pens in a box.
2 of the pens are blue.
4 of the pens are red.
Terri takes at random a pen from the box and writes down it's colour. Terri puts the pen back in the box.
Then Terri takes at random a second pen from the box and writes down it's colour.
a) complete a probability tree diagram.
b) work out the probability that Terri takes exactly one pen of each colour from the box.
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