Let 0 be the nth term of given AP
i.e.,an=0
Given that, first term a = 31,
Common difference, d = 28 – 31 = - 3
The nth terms of an AP is given by,
an=a+(n−1)d
⇒0=31+(n−1)(−3)
⇒3(n−1)=31
⇒n−1=313
∴n=313+1=343=11 13
Since n is not a positive integer, 0 is not a term of the given AP.