Question

if 7th and 13 th terms of an A.P be 34 and 64 respectively,then is 18 th term is​

Answer 1

Answer:

89

Step-by-step explanation:

7th term is 34

a+6d=34....................(1)

13th term is 64

a+12d=64...................(2)

solving 1 & 2

d=5 &a=4

therefore 18th term=a+17d=4+17*5

                                             =89