Question

find the sum of first 20 terms of the list of numbers whose nth term is given by an = 3 - 4n

Answer 1

Answer:

9

Step-by-step explanation:

Given an = 3 + 2n

Now 1st term = ax = 3 + 2 (1) a = 3 + 2 a = 5

2nd term = a? = 3 + 2 (2)

= 3 + 4 = 7

3rd term = a3 = 3 + 2 (3) = 3 + 6