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If in a big hole 1 drop falls for 1 st minute and 2 drops falls for 2 nd minute and it doubles for the next minute and the pond fulls after 20 minutes than

when was the pond half.


On  20^{th} min = Full
Therefore, on  19^{th} min = Full/2
Full/2 = Half

Thus the pond was half on the  19^{th} minute
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