Answer:
The value of d is 4.
Explanation:
It is given that the 6th term of an AP is
and 8th term is
.
The nth term of an AP is

6th term of an AP is
.

.... (1)
8th term is
.

.... (2)
Subtract equation (1) from equation (2).



Divide both sides by 2.

Therefore the value of d is 4.