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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?

  1. 54
  2. 78
  3. 60
  4. 97

Answer

The correct answer is C) 60.

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