Character Puzzles - General Questions

Find the missing number:

4   1   10
9   1   20
6   3   ?

Find the missing number:

8   1   9
3   1   4
6   4   ?

Find the missing number:

3   2   5
9   6   15
7   3   ?

Find the missing number:

4   2   6
5   3   8
4   3   ?

Find the missing number:

2   1   4
8   7   64
5   4   ?