Hello, chakravarthiponmudi!

And they are, too!If and show that are in A.P.

I don't understand how says it to be A.P.

if i am not wrong, a sequence is said to be in AP if the next number in the sequence

differs from the previous number by a constant value . . . . You are right!

If we have: .

Equate [1] and [2]: . see?