What is the sum of the powers of 3 (3^i) that are smaller than 100?
Carla is downloading a 200 GB file. She can download 2 GB/minute, but 40% of the way through the download, the download fails. Then Carla has to restart the download from the beginning. How load did it take her to download the file in minutes?
What is the sum of the 10 first positive integers?