A.P is known for Arithmetic Progression whose common difference = a_n – a_n-1 where n > 0

Common difference, d

To find 18^th term of A.P, firstly find a_n

We know, a_n = a + (n-1) d where a is a first term or a₁ and d is common difference

When n = 18:

Hence, 18th term of A.P. is 34√2