Question

find the sum of the first 25 terms of the arithmetic sequence 4, 10, 16, 22,...? Step by step​

Answer 1

Answer:

1900

Step-by-step explanation:

a=4

d=6

n=25

Sn=n/2[2a+(n-1)d]

Sn=25/2[2*4+(25-1)6]

=>25/2[8+144]

=>25/2[152]

=>25*76

=>1900