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Question 1:
A peasant buys a pregnant sheep, which gave birth to a lamb. At the age of 3, the lamb gives birth to another lamb. After that it starts bearing a lamb per year. How many sheep will the peasant have 9 years after the birth of the first lamb if all the lambs are female and none of them ever dies?
A. 54
B. 78
C. 60
D. 97

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