Question

which term of the AP 100,90,80,...is zero​

Answer 1

100,90,80,70,60,50,40,30,20,10,00

Answer 2

Given=100; d=90-100=-10
an=0
an=a+(n-1)d
0=100+(n-1)-(10)
0=100-10n+10
10n=110
n=110/10
n=11