You randomly choose one hat from 3 green hats, 4 black hats, 2 white hats, 2 red hats, and 1 blue hat. What is the probability o
1 answer:
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DfLet 
and 
. Then
By the chain rule,
where
, so that 
. We have
and so
By the chain rule,
where
and so
answer and explanation are in the picture.
