In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
90, 180, 12, 50, 100, 200, , 3, 50, 4, 25, 2, 6, 30, 3
2, 6, 12, 20, 30, 42, 56,
2 / 5, 3 / 5, 4 / 55, 5 / 25,(.....)
3, 6, 18, 72,
1, 2, 6, 24,
21, 25, 33, 49, 81,