Question

Q. What is the difference between the sum of the first
20 terms and the next 20 terms of the arithmetic
sequence 6, 10, 14, ...?

I do know the answer and steps but I wanted an easier way to solve it. also can someone explain the question.​

Answer 1

Answer:

The nth term of an arithmetic progression whose first term is a1. and whose common difference is d is given by a. n= a1+ (n – 1) d. So, having said that, here n=20, a1=3 and d=20. 20th term = 3+(20–1)*20.