Maya has two bags containing counters.
In the first bag there are 5 yellow counters and 3 purple counters.
In the second bag there are 4 yellow counters and 6 purple counters.
Maya takes at random a counter from the first bag.
She then takes at random a counter from the second bag.
a.[2]
Complete the probability tree diagram.
b.[2]
Work out the probability that Maya takes two yellow counters.