
Patrick B. answered 10/20/19
Math and computer tutor/teacher
First it decreases by 1 because 3-2 = 1
then it decreases by 1/3 because 2 - 5/3 = 6/3-5/3 = 1/3
then it decreases by 1/6 because 5/3 - 3/2 = 10/6 - 9/6 = 1/6
So then next step will be decreasing by 1/9, then 1/12, then 1/15
A1 = 3
A(n) = A(n-1) - (1/(3(n-1))