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Sagot :
Answer:
- 15
Step-by-step explanation:
Floor zero = 0
Up 8 floors = 0 + 8 = 8
then down 17 floors = 8 - 17 = -9
then down 12 floors = -9 - 12 = -21
then up 20 floors = -21 + 20 = -1
then down 14 floors = -1 - 14 = -15
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