157.5 / 3.5 = 45
45 / 3 = 15
15 / 2.5 = 6
6 / 2 = 3
3 / 1.5 = 2
2 / 1 = 2
So the last term should have been a 2 instead of 1.
Correct Series: 157.5 45 15 6 3 2 2