What should come in place of question mark "?" in the following number series?
4, 6, 9, 13.5, 20.25, ?
1
32.75
2
30.375
3
40.5
4
27.225
5
None of these
What should come in place of question mark "?" in the following number series?
4, 6, 9, 13.5, 20.25, ?