Question

121 ,117 ,113,...,1601. then 1601 is what term number.​

Answer 1

Answer:

a= 121 ,d=117-121=-4

then an=a+(n-1)d

an= 121+(n-1)-4

an=121-4n+4

1601=125-4n

1601-125=4n

1476=4n

n=1476/4

n=369 term number