Troubling Tree

Algebra Level 2

Assume that there is a tree that grows in such a way that its height on a given day is twice what it was on the previous day. For example, the tree was 1 meter tall on first day, 2 meters tall on the second, 4 meters tall on the third day, and so on.

On the 50th day, it reached its full length. On which day it was just half the full length?

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