1. {1 point) Find the A" - constant of the following sequences, if one exists. If it doesn't exist, write \"does not exist\". 6,17, 36, 65, 106, 161, ... 2. (2 points) Make up a sequence that would have 4, 4, 4, 4, 4, ... as its second differences. 3. (2 points) Make up a sequence that would have 1, 2, 3, 4, 5, ... as its 3 differences