Question

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Answer 1

first find P(first draw is yellow)=yellow/total
then find P(second is yellow) =(yellow-1)/(total-1)
now the condition is AND so
P(first yellow AND second yellow)=P(first draw yellow) x P(second draw yellow)
follow these steps

Answer 2

Before you pick the first marble, how many marbles are there, and how many marbles are yellow?
After you pick the first marble, how many marbles are there, and how many are yellow?