Question

if the 7th and 13th term of an AP be 34 and 64 respectively, then the 18 term is?

Answer 1

Answer:

89

Step-by-step explanation:

hope this helps you

Answer 2

:

a7=a+6d

=>a+6d=34------(1)

a13=a+12d

=>a+12d=64------(2)

Now,substract (2)from (1) we get,

d=5

So,a+6*5=34-----from (1)

a=4

Then ,a18=a+17d

a18=4+17*5

a18=4+85

a18=89

Therefore 18th term is 89.

Hope the ans was helpful to you....