Answer:
5/12
Explanation:
Total chocolate=12
White=3
Milk=4
Dark=x
White+milk+dark=3+4+x
=7+x
12=7+x
x=12-7
x=5
Therefore,
Dark=5
Probability that Lily first chooses a dark chocolate from the box= No. Of dark chocolate/Total no. Of chocolate
=5/12
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