Question

If 7th and 13th term of an a.p be 34 and 64 respectively then its 18th term is

Answer 1

Answer:

106 is the 18th term of the given AP

Answer 2

Answer:

89

Step-by-step explanation:

nth term=a+(n-1)d

a is first value in a.p

d is difference of the progression

7th term=a+(7-1)d

             =a+6d     -----eqn1

13 th term =a+12d    -------eqn2

if you solve eqn1 and eqn2 then you will get d=5 and a=4

18th term=a+17d

             =4+(17*5)=89

Hope it is helpful