Select the number from among the given options that can replace the question mark (?) in the following series.
6, 24, 9, 22, 14, 18, 21, ?, 30
1
18
2
14
3
16
4
12
Select the number from among the given options that can replace the question mark (?) in the following series.
6, 24, 9, 22, 14, 18, 21, ?, 30