Question

An arithmetic progression has 20 terms. Nth

term from the starting and Nth term from

ending are 10 and 190 respectively. Find the

sum of all the terms in the series​

Answer 1

Answer:

2000

Step-by-step explanation:

by using the below formular for n = 20 terms, a= first term, l = last term

Sn=n/2(a+l)

S20=20/2(10+190)

S20=10(200)

S20=2000

Answer 2

Answer:

Step-by-step explanation:

Sn=n/2(a+l)

S20=20/2(10+190)

S20=10(200)

S20=2000