Mathematics
30:00
Course
IOE
Mode
medium
Answered
0/25
Local
0
Curated
25
easy 0
medium 25
hard 0
Question 1 of 25
medium
The n-th term of the series 1, 3, 6, 10, ... is:
A
n(n+1)/2
B
n^2
C
2n-1
D
n(n-1)/2