A deck of cards had 7 blue cards, 11 red cards, 9 yellow cards, 8 orange cards, and 10 green cards. What is the probability that
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Answer:
Please refer to the attachment
at the beginning of year 4, only 3 years have elapsed, the 4th year hasn't started yet, since it's at the beginning, so at the beginning of year 4 we can say only 4-1 years have elapsed.