Question

is 89 a term of ap 4,9,14,................if yes then which term

Answer 1

Answer:

sn=n÷2(a+l)

Step-by-step explanation:

an=a+(n-1)d

89= 4+(n-1)5

89-4=(n-1)5

85÷5=n-1

17+1=n

n=18