Question

Which term of the ap 72,68,64,60,.....,is 0

Answer 1

ap is 72,68,64,60,.....

here

a= 72

d= -4

hence

0= 72+(n-1)(-4)

-72= (n-1)*-4

-72/-4= n-1

18+1= n

n= 19

the 19th term of the ap is 0

Answer 2

a =72

D=-4

An=0

Therefore

An=a+[n-1]d=0

=>72+[n-1]-4=0

-4n+4=-72

4n-4=72

n=76/4

n=19

Hence the 19 th term is 0