Question

find the sum of the arithmetic sequence 1,1 1/2 ,2, 2 1/2,...,100​

Answer 1

the sequence is

1, 1.5, 2, 2.5, .....100

a = 1,

d = 0.5

100 = 1 + (n-1)*0.5

(n-1)*0.5 = 99

n-1 = 99/0.5 = 198

n = 199

sum = 199/2(1+100)

= 199*101/2

= 10049.50

Answer 2

Answer:

Here you go!!

Hope it helped you.