Question

If 7th term amd 13term of ap is 34 and 64 find 18 term

Answer 1

Answer:

Step-by-step explanation:

a7=34

a13=64

34=a+6d, a=6d-34

64=a+12d, a=12d-64

equate the value of a

6d-34=12d-64

-34+64=12d-6d

30=6d

5=d

a7= a+(7-1)×5

34= a+30

a= 4

a18= 4+(18-1)×5

a18= 4+85

a18=89