Character Puzzles - General Questions

Find the missing number:

4   2   18
7   2   51
7   1   ?

Find the missing number:

2   1   4
8   7   64
5   4   ?

Find the missing number:

5   4   25
3   1   6
7   2   ?

Find the missing number:

6   2   38
5   2   27
6   4   ?

Find the missing number:

4   3   14
2   1   6
7   6   ?