What is the answer to 3.6 code practice on edhesive computer science?

3. bob is arguing that if you use output feedback (ofb) mode twice in a row to encrypt a long message, m, using the same key each time, it will be more secure. explain why bob is wrong, no matter what encryption algorithm he is using for block encryption (15 points).

10. when you create a pivottable, you need to specify where to find the data for the pivottable. is it true

How do you take a green screen out of the video while editing?