Question

what will be the common difference of an A.P whose first term is a and nth term is b?​

Answer 1

Answer:

We have,

first term A=a

Common difference D=?

And n th term A

n =b

Then,

We know that,

A n =A+(n−1)D

⇒b=a+(n−1)D

⇒(b−a)=(n−1)D

⇒D= (n−1)/(b−a)

Hence, this is the answer.