Question

9th term of an Ap is 18, if common difference is 2 then find a and Ap ?

Answer 1

okay 9th term is by an= a(n-1)d

Answer 2

Hey !!

Given,

9th term of an Ap is 18

a + 8d = 18

Common difference d = 2

a + 8( 2 ) = 18

a + 16 = 18

a = 18 - 16

a = 2

a + d = 2 + 2 = 4

a + 2d = 2 + 4 = 6

Therefore Ap = 2,4,6,......18......