Question

if 70th term is of ap is 0 then the ratio of 31st and 57th term is​

Answer 1

Answer:

3:1

Step-by-step explanation:

give

70th term is 0

so a+69d=0

or a = -69d

Now a[31] = a+30d

                = -69d+30d = -39d

a[57] = a+56d

        = -69d+56d = -13d

Now

a[31]/a[57] = -39d/-13d = 3

or a[31] : a[57] = 3 : 1