Hello, I have no idea how to go about when finding, "missing terms." I would like to know how to at least start solving these type of problems. Many thanks in advance!

A. "Fill in the missing terms for each arithmetic sequence:"

1) 3, __,__,__,__,__,__,__,__,__, 75

2) __,__,__, -4, __,__,__,__,26

B. "Fill in the missing terms for each geometric sequence:"

1) 100,__,4

2) 2,__,__,__,162