How to use a tree diagram to solve probability - GCSE question level 5

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This video is all about how to use a tree diagram to solve probability and forms part of the playlist 'How to use a probability tree diagram.' I've also added to GCSE Higher Revision.

The question is around level 5 GCSE mathematics:

There are only red marbles and green marbles in a bag.
There are 5 red marbles and 3 green marbles.
Dwayne takes at random a marble from the bag.
He does not put the marble back in the bag.
Dwayne takes at random a second marble from the bag.
(a) Complete the probability tree diagram
(b) Work out the probability that Dwayne takes marbles of different colours.


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