Which term of AP 20, 19 1/4, 18 1/2, 17 3/4........... is the first negative term?

Which term of AP 20, 19 1/4, 18 1/2, 17 3/4........... is the first ne

1.	Which term of AP 20, 19 1/4, 18 1/2, 17 3/4........... is the first negative term?
Answer» 21stterm