Question

9. A) What is the sum of the first Five terms of the Of the arithmetic sequence 1,3,5,7......?
B) What is the sum of first n terms of the Arithmetic sequence 1, 3, 5, 7........?
C) Find the sum of the first n terms of the Arithmetic sequence 1/n 3/n, 5/n, 7/n, .......
D) What is the sum of first 2020 Terms of the arithmetic sequence 1/2020, 3/2020,5/2020.........?​

Answer 1

Step-by-step explanation:

9A). Sn=5/2 {2×1+(5-1)×2}

=5/2{2+4×2}

=5/2×10

=5×5

=25

Answer 2

Answer:

a)25

b)n$2$

c)n

d)2020