Question

find whether 0 is the term of ap 40,37,34 ,31

Answer 1

Formula
0=a+(n-1)d
0=40+(n-1)-3
0=40+(-3n+3)
0=40-3n+3
-40-3=-3n
-43=-3n
43=3n
43/3=n


It is in fraction so zero can't be in term of ap

Answer 2

0=a+(n-1)d
0=40+(n-1)-3
0=40-3n+3
3n=43
n=43/3
so 0 is not any term of AP