Three series I, II, and III following a certain pattern are given below. In the series, one of the numbers is missing in the numbers in series I, in series II, and in series III are represented by 'x', ''y', and 'z' respectively.
Series I: 484, 709, 931, ______, 1366, 1579
Series II: 1170, 468, 234, ____, 156, 312
Series III: 36, 27, 19, 12, 6, 1, _____.
What is the value of (x + z - y)?
1
839
2
836
3
850
4
991
5
None of the above