The sum of the arithmetic sequence 5, 10, 15, 20 is
100
25
50
75
The correct option is
C
Given, number, 5, 10, 15, 20
∴5+10+15+20=50.
For an arithmetic sequence, what is the sum of three consecutive terms?
Th sum of the first 30 terms of the arithmetic sequence 10, 18, 26... is ___.