1 . In the middle of around pool lies a water-lily . The water-lily doubles in size every day . After exactly 20 days the complete pool will be covered by the lily. After how days will half of the pool be covered by water-lily ?
- A. 3
- B. 7
- C. 10
- D. 15
- D. 19
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Bangladesh Bank - Assistant Director - 2011
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