Question

if the 71th teem of an Ap is 34 and 13 tg term is 64 then its 18th term is​

Answer 1

Step-by-step explanation:

34 = a+6d

64 = a+12d

Substract (1) from (2)

30= 6d

d = 5

and

34 = a + 6(5) = a+30

a= 34-30 = 4

So 18th term is

a+17d= 4 + 17(5) = 89