In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces
Next number is sum of all previous numbers.
1st Term : 1
2nd Term: 4
3rd Term: 1+4 =5
4th Term: 1+4+5= 10
5th Term: 1+4+5+5=20 and so on....