The probability that one would have selected 2 five-dollar bills is; 1/4.
What is the probability you will have selected 2 five-dollar bills?
It follows from the task content that the piggy bank contains; 4 one-dollar bills and 4 five-dollar bills to make a total of 8 bills.
Hence, provided the probability events are carried out with replacement, the probability to have selected 2 five-dollar bills is;
= 4/8 × 4/8
= 1/4.
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