Question

the 4th term of an ap is zero prove that the 25term of the ap is three times its 11 th term

Answer 1

a + 3d = 0. (1)

a + 24d = 3 (a+ 10d). which is true
a+ 24d = 3a + 30d. which is true
2a + 6d = 0. which is true
a + 3d = 0. which is true (2)


So (1) and (2) same